The storage tank is the source of the most common problems with under-sink RO units after the first couple of years of using the system. 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. We suggest that our customers don't alter the air pressure to their tank without consulting us first, as low water pressure to the RO system is another common issue that will prevent the tank from filling with water.

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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.

To avoid bad odors from diaphragm, all of our diaphragms are post-cured before assembly, to eliminate the possibility of odors from the tank. Tanks are NSF approved under standard 58, and CE approved under the PED (pressure equipment directive), because of these approvals our tanks carry the appropriate marks and can be used everywhere in the world.

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Lead leaching to drinking water the cause of health risks, and brass and copper are banned for use in purified/drinking water; so all PAE expansion tanks use stainless steel connections to avoid the lead leaching concerns.

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The biggest misunderstanding about RO tanks is that they hold the amount of water that the tank holds, most manufacturers list the total volume, it actually holds considerably less as 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.

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Product Standards · ASSE/CSA Joint Harmonize Task Group (JHTG), ASSE 1013, Reduced Pressure Principle Backflow Prevention Assemblies, ASSE 1015, Double Check ...

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In the picture, the stem at the top of the tank is where water both enters and leaves the tank. The blue cap on the front near the bottom covers a standard Schrader air valve (just like the valve on a bicycle or automobile tire.) This is where air is pumped into the tank. The air valve on some tanks is in a different place, so you may have to look for it.

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TankPAC Industries Co., Ltd. is one of the largest pressure tank manufactures in the world today. To provide the high quality tanks and good service to satisfy our customers needs is always our goal. Good is not enough for us; we want to be the best in the industry.

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TankPAC pressure tanks use a butyl diaphragm and polypropylene liner to separate the water and air. These materials limit the growth of germs and prevent impurities inside the tank.

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Another common misconception is the belief that the tank's external material affects the quality of the water. In fact, the water you're going to drink doesn't touch the metal or plastic that the tank is made from, except for the spout at the top, which is stainless steel on most modern metal tanks, the water does not touch the metal. The water contacts only the Butyl bladder, which is an inert material has been used for years for both RO and well tanks.

Water goes through a reverse osmosis membrane very slowly and people don't have the time or patience to wait a long time to get a single glass of water. For this reason, most home/residential reverse osmosis systems need a water storage tank to store the purified RO water. Reverse osmosis storage tanks can delivery stable and constant water flow when the faucet is opened. The concern that pollutants might come from air or animals with the use an opened tank favors the use of a closed expansion tank.

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When the RO tank is empty of water, it should have a maximum air pressure of 5-7PSI, as water is forced into the tank by operation of the RO unit, pressure inside the tank increases. Our Standard RO units have a auto shut off 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 city water pressure is 60PSI, then the RO unit will fill the storage tank to around 40PSI before shutoff. If, however, your city pressure is only 50PSI, the RO unit will stop filling the tank when the pressure in the tank reaches a bit over 30 psi. This lower pressure may make it difficult to supply an ice-maker with your RO unit.

Here is a sample side view of what it looks like on the inside of an RO tank.Actual interior construction of tanks may differ, but the illustration shows the basic arrangement.