The quality, chemical composition and purity of the water supplied by the central water supply, we make a number of well-grounded claims. They are justified by the deterioration of health, rapid wear of equipment and eternal problems with the pressure of water. And our physical and economic condition deserves attention, agree?
To combat these negative circumstances, there is a proven method - you need a filter for rough and fine cleaning. Depending on the tasks to be solved, both individual devices and a group of interconnected devices performing multi-stage processing are mounted.
Here you will find out what kind of work a particular type of device does, in what order they are placed, how they ultimately affect the quality characteristics of water. For a complete perception of information, we have attached visual illustrations and video guides.
The stages of filtration during water treatment
The first, most important step in water treatment is mechanical cleaning. Coarse purifiers extract particles from 1 micron and higher from water. They perform an indispensable function in the filtration process, without which further water treatment is impossible.
Rust, sand, clay particles, scale from old water pipes - everything is removed to get clear water at the exit.
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Throughout the autonomous water supply system, it is equipped with a set of filters that perform various tasks of water treatment
The screen filter is the very first one to be installed in the circuit, which mechanically holds mineral and organic particles
A similar strainer, performing rough water purification, is placed at the inlet to the surface pump: either at the edge of the suction pipe or in front of the unit nozzle
If it is supposed to pump water directly to the consumer, for example, to the pool, then the strainer is installed on the pipe, and a sorbing filter is installed in front of the pump
To protect the equipment included in the water supply scheme, the so-called mud collectors are used - coarse filters. They are placed mainly inside the house, but it is excellent if they are located on external areas
Preparation of water for drinking use is carried out by cartridge filters, sorbing impurities, and fine cleaning systems.
Filtering devices with cartridges located inside carry out deferrization, retention of salts of heavy metals and softening
Fine water purification is carried out by systems including a series of superthin filters, as well as reverse osmosis systems, bacteria water and harmful microorganisms that extract them
Natural water filtration
Submersible pump strainer
Surface pump inlet filter
Water preparation for transfer to the consumer
Main filter in water supply
Installation for water purification
Only after the first stage of pre-filtration can we begin to eliminate organic impurities, compounds of heavy metals, chemical elements and microorganisms. For this, ultrafine filtration devices are used.
More specifically, the need for cleaning from certain contaminants can be determined only on the basis of the results of analyzes.
In order to make the right choice of a filter, it is necessary to clearly determine why you need to install it:
- for filtering hot or cold water;
- what kind of contaminants must be cleaned;
- what performance and load volume the filter should have;
- for what purposes - to protect plumbing and equipment or for drinking water and cooking.
It is also necessary to consider where the device will be used - in a private house, apartment, in a boiler room or in an industrial enterprise.
When buying a filter, you can check the data with the table and see if the declared level of cleaning meets the capabilities of the product. For example, often in the parameters of the device for fine cleaning indicates the possibility of filtering from impurities with a size of 100 microns or more, which actually refers to rough cleaning
Design and use of coarse filters
Coarse cleaning devices may have different designs, but the principle of operation is similar. Inside they have a removable element, which can be in the form of a metal mesh, disk, cartridge - it performs filtering. There is also an outlet for collecting contaminants. The device is periodically washed to remove collected debris.
Additionally, devices can be equipped with a pressure gauge to help control the pressure in the system. A drop in water pressure may signal that it is time to change or rinse the cartridge, the mesh.
Filters can also be paired with a gearbox that lowers pressure, dampens water hammer. Some models have valves.
The general properties and differences of different models are in the following characteristics:
- Filter element. For rough cleaning, a metal mesh, a polypropylene fiber cartridge, a disk element are often used.
- The method of cleaning up accumulated dirt. The devices are divided into those that are washed in manual mode and self-washed.
- Possibility of use for hot, warm or cold water.
All differences affect the functionality of the devices. Therefore, further - in more detail about their capabilities.
Such filters are installed on almost every water supply system, as they are durable and easily cleaned from accumulations of dirt.
Coarse sedimentation filters
Sedimentary filters include devices with a mesh for filtering. They are mainly made of a metal case (brass or stainless steel) with a direct or oblique branch located directly perpendicular or at an angle. Inside, along the water, a stainless steel mesh is placed.
There are also models of conical axial devices in which the casing is straight and the filter screen has a cone shape and is located inside. Their design provides low hydraulic resistance.
The grid can be made of carbon fiber, fiberglass, metal. A metal element is more easily deformed, which leads to a decrease in throughput, but it is easy to clean. Conversely, carbon fiber netting is stronger, but washing it can be difficult
They are installed on the site of the steam heating system in front of the circulation pump, in the water supply system - in front of the water meter. When installing in front of the pump, it is necessary to study the parameters to prevent an increase in the load on the pump. In addition, some manufacturers directly prohibit the installation of any devices in front of their equipment.
The filter in the form of a cylinder made of metal mesh is used for installation at the site of water intake from the source. It is used to prevent large debris from entering the water supply and to prevent damage to the pump.
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Self-disassembling the sump
Coarse filter mesh
Actions after cleaning the filter
Self-washing trunk devices
The design of the filter consists of a housing, a cartridge, a flushing valve. The metal or plastic case has two holes that connect to the water main. The filtering mesh from a stainless steel - removable, detains mechanical impurities from 100 microns.
At the bottom of the housing bowl there is a backwash valve. Some models are equipped with a pressure gauge to monitor the degree of contamination.
The self-washing filter for rough cleaning is used for heating and plumbing systems. It removes impurities from 100 to 150 microns in size.
The principle of operation of the device is to pass the stream through the filter element - a removable cartridge made of stainless steel. Mechanical pollution while retained in the grid. Some of them remain in it, and some settle on the bottom of the hull.
A feature of self-washing devices is the ability to remove accumulated dirt without disassembling or unwinding the case. To do this, open the tap located at the bottom of the housing and drain the water into a container or sewer.
Particles of debris are washed away by the stream, and the device continues to work as usual. To remove old deposits on the grid, you can remove it and clean it more thoroughly.
The flush valve can be connected to a drain pipe connecting to the sewer, this simplifies the maintenance process.
Disk Filter Processing
The devices are used mainly for pre-treatment, prepare water for further cleaning, softening and iron removal. They are installed in centralized and autonomous water supply systems, in heating plants, and are used in irrigation systems, including drip systems.
The filter element is a polymer disc, dressed on an axis and tightly compressed between each other. Their surface is covered with small grooves, the dimensions of which determine the degree of purification, comprising from 20 to 400 microns.
The cleaning process is as follows: a stream of water fills the housing and seeps through the flow grooves in the disks, and then is discharged into the outlet. Over time, dirt settles and accumulates on the surface.
A decrease in water pressure is a signal that the device needs to be cleaned again. The degree of clogging can be determined using a manometer.
Disk cleaning can be done in two ways - manual or automatic, when connected to the sewer
Cartridge filters for fine and coarse cleaning
Cartridge filters are very popular because they have a relatively low cost and can be used to filter industrial and drinking water. They release water from large suspensions - sand, rust, and also from small particles up to 1 micron (0.001 mm) in size.
Cope well with the removal of turbidity. Devices with a throughput of 100 to 20 μm are used on main filters for rough cleaning, from 10 to 1 μm are used for the treatment of drinking water.
They are produced in the form of a flask with a cartridge made of polyester or twisted polypropylene thread. It is installed on the pipeline highway. After the cartridge has exhausted its life, it is replaced. The removable element is not to be washed and reused.
Often, models with a removable disposable filter are used in conjunction with mesh devices. First, the filter mesh is installed along the flow of water, since it is washed and can be used repeatedly
Cartridge Filler Materials
For the manufacture of the cartridge using polypropylene fiber, woven polypropylene rope (cord), cellulose impregnated with polyester, nylon cord. But it was propylene that gained the greatest popularity due to the fact that it has a low cost, is not exposed to chemicals, is not destroyed by the action of biological organisms.
Filters made of polypropylene cord use a special winding method, which allows larger suspensions to settle on the outside of the cartridge, and small particles remain inside the coil. They do not clog very quickly, but the more they exhaust their resources, the more they pass pollution.
For water supply, this is just a positive feature, because a dirty filter does not reduce the pressure in the system. Polypropylene fiber has a foamed structure that contains small bubbles, it is they that accumulate pollution. The disadvantages of the material is manifested in cheap low-quality models.
During water treatment, an external filter ball is clogged in them, while the inner layer may remain clean, that is, not participate in the filtering process. But high-quality cartridges work all over.
A significant drawback of polypropylene fiber is that when it is very dirty, it ceases to pass water and significantly reduces the pressure of water. This may adversely affect the operation of pumping equipment.
The temperature of use of products made of polypropylene is 1 - 52 ° C. They can be used for cold and warm water. For the treatment of hot water, it is necessary to use cartridges made of cotton fibers impregnated with a special substance. They withstand high temperatures (up to +93 ° C), exposure to microorganisms and various substances.
Ultra-fine drinking water purification
After removing solid particles and turbidity from water during rough cleaning, it still contains many substances - dissolved impurities and harmful microorganisms, the presence of which makes it impossible to use it to quench thirst.
New generation fine filters are able to purify water to such an extent that it does not need to be boiled to get drunk.
Those wishing to receive information on filtering devices from leading manufacturers in the segment of the mass will find a lot of useful information here. We advise you to read an article on this issue.
Sorption filters for cleaning
Sorption filters are used to remove sand, silt, rust fibers, various impurities of 20-40 microns in size, including clay and colloidal iron. They have a high resource and productivity and can accumulate a large number of suspensions.
Able to neutralize unpleasant odors, pathogenic bacteria. Some models of devices enrich water with iodine and fluorine; in some, silver ions are used to neutralize harmful microorganisms.
For absorption, granular activated carbon or aluminosilicates are used. Activated carbon can handle substances such as chlorine, radioactive elements, pesticides, heavy metals, petroleum products and dyes. Absorbs chlorine, calcium, phosphorus, relieving water from excessive hardness.
Aluminosilicates neutralize heavy metals, organic impurities, establish the optimal acid-base balance.
Compared to mesh and disk, it functions more efficiently, removing suspended particles
Sorption filters can be manufactured for domestic purposes - in the form of jugs or tanks, and for processing large volumes - as trunk devices. Regeneration is carried out using a reverse current of water. A significant drawback of such filtering systems is the high cost, several times higher than the cost of other installations.
Ion exchange species for water softening
Ion-exchange filters serve to soften water, remove organic impurities. They are made in the form of a plastic or metal (stainless steel) case with ion-exchange material, and containers for a regenerating (saline) solution. The principle of operation is based on the passage of water through bulk filters, where it gets rid of stiffness ions.
Different models of ion-exchange filters differ in performance, volume of working tanks and components that are used as filter media
Efficiency depends on the chemical characteristics of water, filter material and room temperature.
The main drawback of such installations is the complexity of maintenance, which requires the use of regenerative tanks, disposal of used components, and a small filter resource of about 200-800 liters.
Membrane (reverse osmosis) filter
The technology of cleaning with membrane filters is based on the passage of water through a large area of corrugated material with pores of no more than 3 microns. At the same time, the membrane filter holds impurities on the surface without passing them inside, which significantly increases the resource of the filter material.
Typically, a membrane filter is part of a multi-stage cleaning process and is installed after the coarse cleaner and charcoal filter.
Water enters the membrane filter through the inlet pipe with a sealing ring, using a high pressure pump. After passing through all stages of filtration, it is divided into permeate (highly purified water) and concentrate (solution of various impurities), which accumulates in the drainage collector.
The degree of filtration depends on the size of the pores in the membrane:
- up to 1 micron - microfiltration;
- up to 0.1 microns - ultrafiltration;
- up to 0.01 microns - nanofiltration;
- less than 0.001 microns - reverse osmosis.
Reverse osmosis plants perform the highest possible filtration of water, purifying it at the molecular level, removing all microorganisms, salts of heavy metals, and organic impurities.
After passing through such a filter, only 20-30% of mineral substances remain in the water, it becomes weakly mineralized, which can be interpreted as a virtue and a disadvantage.
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The highest possible degree of purification of drinking water is carried out by a plant operating on the principle of reverse osmosis
The installation includes: a mechanical sediment filter, carbon sorption filters, a block with a semi-permeable reverse osmosis membrane, and a post filter
The installation, including a set of filtering devices, purifies water by 99%. Removes all kinds of inclusions, viruses and bacteria.
Purified tap water is supplied through a separate chrome-plated faucet. There is a storage tank for water
You can assemble and install a reverse osmosis system with your own hands due to the extreme simplicity of the design
The instructions supplied by the manufacturer to the equipment describe schemes and assembly options. All system components are numbered.
The frequency of change of the reverse osmosis unit depends on the quality of the supplied water and its composition typical for the region
The disadvantages of reverse osmosis systems include a rather impressive size and a too high degree of purification, eliminating not only harmful substances from the water, but also useful minerals
Installation for the preparation of drinking water
The composition of the filtration complex
The degree of purification by reverse osmosis system
Devices for collecting purified water and feeding it to a water intake
Self-assembly cleaning system
Numbering blocks with filters
Replaceable filling of filtering blocks
Disadvantages of reverse osmosis systems
A rating of water treatment devices installed for a kitchen sink will be introduced by a useful article, the contents of which we recommend to read.
Filter maintenance and cartridge replacement
Maintenance of the sediment filter involves periodic cleaning of the filter screen. Before starting work, you need to turn off the tap, then unscrew the revision cover and remove the mesh. The frequency of inspections depends on the quality of the water, on the degree of its pollution. After cleaning, it is necessary to reinstall the elements and check for leaks.
To avoid destruction of the filter elements, it is not recommended to use detergents containing a solvent.
To clean the disk filters, they must be removed from the line, open the housing and remove the filter element. When removing the filter, the latch, which presses the disks against each other, loosens and they open. Further, all elements are washed, for a more thorough cleaning, the device is disassembled and cleaned with a brush or sponge.
It is possible to carry out automatic flushing without dismantling the internal elements by starting the water flow in the direction opposite to the working
Polypropylene cartridge filters must be replaced after contamination. Manufacturers of different models on the packaging indicate the amount of water in liters that the device can clean.
Objectively, the filter life depends on the state of water in a centralized water supply system or an autonomous source. Therefore, he can serve up to six months. But if a water supply rupture or for other reasons, it can become clogged even in one day.
The need to replace a cartridge is assessed by its condition (degree of contamination). A signal may be a decrease in pressure in the water supply
In reverse osmosis fine filters, the replacement time for replaceable elements depends on the type of filler. For prefilters it is half a year, for a coal postfilter - a year, for a membrane - 2 - 2.5 years.
To correctly place the replaceable elements, you must remember their original location. Before you start drinking water from a new filter or cartridge, you need to flush the system - drain the water after the first filling of the tank.
After prolonged shutdown of the system for more than 3 months, and even after replacement of replaceable elements, it is disinfected. If in the filter there is a rapid development of microorganisms and fouling of the prefilters, it is recommended to additionally install an ultraviolet lamp complete with the main prefilter.
Rules for installing filtration devices
With a multi-stage cleaning device, the first stage is always a filter that performs rough cleaning. When using several types of systems, first mount the device with a large micronage.
If you install filters of different cleaning methods in the wrong order, they will not be able to fully perform the task.
Installation of filtering devices in front of pumping equipment is not recommended. An exception is strainers with around zero resistance, which protect the pump from large debris.
The use of any other filters - iron removers, softeners, etc. - will increase the load on the pumping station and cause its premature wear. Installation, adjustment and repair are carried out in the absence of pressure in the water supply.
Installation of sedimentary filters (mud collectors)
Oblique and direct clutch filters are installed in horizontal sections of the water pipe exclusively in the direction of flow. Oblique filters can also be mounted on a vertical pipe if the flow moves from top to bottom.
The direction of flow should correspond to the arrow marked on the filter. Improper installation will lead to poor throughput and clogged piping (+)
The filter should not be subjected to stresses from vibration, bending, compression, and stretching of the pipeline. When installing it, uniform fastening of the fasteners is achieved, if necessary, mount expansion joints and supports that reduce the load.
The correct filter location is the revision cover down. For carrying out preventive maintenance, free space is provided under the device.
The mesh filters according to the insertion method are divided into coupling and flange. The first type is installed on pipes of small diameters, the second type is used for main water supply systems, interchanges in the water supply system of apartment buildings. On pipes with a diameter of up to two inches, threaded filters, the so-called American women, are used.
The filter that cuts into the water supply can have a different degree of cleaning and the nature of the filter, washed manually or automatically
How to install a reverse osmosis system?
Installation of the filter is carried out in an easily accessible place on a horizontal section of the water pipe with the bulb pointing down. When installing a water meter, the filter should be placed in front of it.
Installation is carried out in the following sequence:
- Anaerobic sealant is applied to the connecting thread, filling all the grooves with an even layer and leaving it to solidify for 15 minutes.
- Next, attach the fasteners to the filter, paying attention to the direction of the flow of water in the water supply.
- Attaching the filter fasteners to the wall, and making sure that the bends of the device coincide with the position of the pipe, mark the places under the holes.
- Drill holes and insert the dowels, then, using screws, screw the holder with the filter to the wall.
- To connect the filter taps to the line, cut the pipe and bend it to align its axis with the axis of the filter. So that the pipe does not break when it is bent, a special conductor is brought into the middle.
- Then put on the crimp ring and nut, insert the fitting (all the way). The compression ring is tightened close to the fitting and the nut is tightened.
- Connect the fitting to the filter and tighten the union nut tightly tightening with a wrench.
After installation, open the water, check for leaks. For ease of repair and maintenance, shut-off valves are provided on both sides of the device.
Reverse Osmosis Filter Connection
The installation of the treatment system consists in the assembly of individual elements and does not require special tools. Therefore, even a person who has never done this can install a reverse osmosis system.
The manufacturer recommends placing the filter under the kitchen sink. In order to comfortably collect filtered water, a separate tap is installed. To install it, you will have to drill a hole in the corner of the sink or in the area of the countertop near the sink.
As standard, the reverse osmosis system does not have a pump to increase pressure - if necessary, it is installed separately. Additionally, the system can be equipped with an ice maker and replaceable elements for more efficient removal of fluorine and nitrates.
The reverse osmosis filter is assembled as a designer. Installation consists of the following stages:
- installation of a drinking tap and its connection to the filter;
- connection to the cold water pipeline;
- installation of the ball valve of the tank and the drain clamp;
- commissioning and flushing the system.
For good performance and performance of the reverse osmosis filter, it is necessary to ensure a normal pressure in the system. If the water pressure in the supply pipe does not exceed 2.8 bar, it is recommended to install a booster pump.
It is installed in front of the first filter in the gap of the incoming tube. When using a pump, it is necessary to install a high pressure sensor - it automates the process of turning the equipment off and on.
Owners of their own pools will receive a lot of useful information about filtering installations in the next article, which we recommend that you read.
Clip # 1. How to choose a filter according to the degree and method of cleaning:
Clip # 2. How to insert a filter into a water supply system:
Clip # 3. Reverse osmosis filter installation and cartridge replacement:
When choosing a device for water treatment, the question is not what filter to install - for rough or fine cleaning. It is more correct to ask the question, for what purposes water will be used and what result should be achieved.
It is necessary to use devices for water filtration, starting from rough cleaning and ending, if necessary, with the finest one, which will remove impurities to the smallest particles.
Those wishing to share experiences, express opinions, ask questions, note shortcomings in the material presented, we invite you to write comments. You can leave them in the block located under the text of the article.