3 Gallon Plastic Reverse Osmosis RO Pressure Storage Tank

Finest Filters 3 Gallon Plastic Reverse Osmosis pressure water storage tank.

This tank comes supplied with ¼” push fit tank ball valve as pictured.
In stock
SKU
2556
£32.99

In stock in our UK based warehouse for same day dispatch when ordered before 4pm. Read more...

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Finest Filters 3 Gallon Plastic Reverse Osmosis pressure water storage tank.

Pressure tanks used with under-sink reverse osmosis units are miniature versions of pressure tanks used on residential water wells. Water is stored in a bladder, made of a material called butyl. When there is a demand for water, the water is pushed out of the tank's bladder by air pressure. A standard Schroeder air valve, like the valve on a bicycle or automobile tyre, allows air to both enter and leave the tank. The air valve on different tanks can be found in different places, so you may have to look for it. In some RO tanks, the air valve is located on the bottom of the tank.

When the RO tank is empty of water, it should have a pressure of five to 10 psi air. As water is forced into the tank by operation of the RO unit, pressure inside the tank increases. Standard RO units have a hydraulic shutoff valve that stops production of water when the pressure in the tank reaches approximately 2/3 of the pressure of the tap water that supplies the RO unit. Thus, if your mains water pressure is 60 psi, the RO unit will fill the storage tank to around 40 psi before shutoff. If, however, your mains pressure is only 50 psi, the RO unit will stop filling the tank when the pressure in the tank reaches a bit over 30 psi.

The biggest misunderstanding about RO tanks is that they hold the amount of water that the tank manufacturer says. They actually hold much less. That's because much of the inner space of the tank is occupied by air and a heavy bladder. Typically, you'll get about 2.5 gallons of water out of what is commonly called a 4 gallon RO tank.

Another common misunderstanding is the belief that the tank's external material affects the quality of the water. Actually, the water you're going to drink doesn't touch the material that the tank is made from. Except for the spout, which is food grade PP on most modern tanks, the water does not touch the tank. The water contacts only the butyl bladder. Butyl has been used for years for RO tanks and well tanks and is regarded as inert.

The storage tank is an integral part of all undersink RO units and needs to be maintained and managed carefully. Not enough air in the tank results in not enough water at the faucet. Too much air also results in not enough water at the faucet.

This tank comes supplied with ¼” push fit tank ball valve as pictured.
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