The reverse osmosis filter guarantees the highest degree of water purification. It consists of several coarse filters, a membrane compartment where reverse osmosis technology is purified, and a storage tank, where purified water is pumped to create pressure in the water supply system. The tank, in turn, consists of a steel or plastic body, where a rubber membrane is inserted, which divides the tank into two parts. Purified water is pumped into the upper one through the inlet pipe. From it, it is fed into the water supply network. Air is pumped into the second at the plant. The incoming water squeezes the membrane, and it, in turn, under the influence of air presses on the liquid, creating pressure in the water supply system. The technology for creating a water pressure is simple, it depends on the pressure under which air is pumped into the lower part of the storage tank. Pumping is carried out through a nipple, which is located on the side of the tank below the level of the rubber separator.
What should be the air pressure
Standard air pressure parameters are 0.3-0.5 bar. Most manufacturers adhere to the maximum performance. You can't do more. This can lead to the automatic closing of the non-return valve, which is installed between the filters and the storage tank. Water passing through the filter will not open it, because its pressure will not be enough to withstand the pressure from the tank.
If the pressure is high, it can lead to rupture of the rubber baffle; if insufficient, reverse osmosis technology will be disrupted, that is, the water will not be filtered. Therefore, it is very important to control the pressure inside the storage tank.
Check the pressure through the installed nipple. A pressure gauge can be connected to it. Experts recommend using an electronic type pressure gauge for testing. It is more accurate. Some people use automobile pumps; a dial gauge is already installed in their design. It has a large error, therefore, it will not work to guarantee high measurement accuracy with this device.
If over time the pressure inside the storage tank has dropped, air can be pumped in with the same car pump. If a compressor is available, it is best to use it. The main thing is to control, not to exceed the parameter.
Causes of pressure drop inside the water supply network
The very presence of the filter requires its maintenance. It mainly consists of timely flushing. Since the set of the reverse osmosis filter includes three coarse cleaning and post-treatment devices, their maintenance consists in replacing the cartridges. If this is not done, the permeability of the devices drops sharply due to contamination of the filter elements.
In order for water molecules to pass through the filter membrane, the pressure in the reverse osmosis storage tank must be at least 3 atm. If an electric pump is included in the package of the filtering device, the water pressure in the water supply system can be in the range of 1-1.5 atm, because the pump will create the required pressure. But it requires a sufficient amount of pumped liquid. Therefore, a filtering device operating on the principle of reverse osmosis is recommended to be installed in autonomous water supply systems, where water is taken from a well or well. In such networks, powerful pumps are installed that provide the required pressure parameters.
Storage tank malfunctions
Often, during long-term operation, the reservoir fails or does not perform its functions correctly.
The first common malfunction - water began to leak from the nipple. The reason - the rubber partition was torn. The problem is solved in one way - to change the tank completely to a new one, taking into account its volume.
Manufacturers recommend changing the container once every 3-4 years. It all depends on the intensity of operation of the water supply network.
The second malfunction - the nipple bleeds air. The problem is solved simply - the failed part is unscrewed, and a new one is screwed in its place. It is important not to forget to put a rubber or polymer gasket under the nipple, which ensures the tightness of the connection.