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Low pressure from the undersink osmosis filtration system

I have an undersink water osmosis system. I have always had low water pressure. On a good day I can get 3 to 4 cups before the pressure dwindles to a trickle. Presently I can barely get a haf cup before it slows down and takes forever. Someone said I need to use a pump to increase pressure in tank. I changed my filters earlier this year, but never changed the 'bladder'. I know this may need replacing now, but is this the problem or do i need to pump up the pressure and if so how. Note I have never really had lots of water pressure but it was alwyas fairly reasonable. Thanks for any suggestions.

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  • James Feragola
    James Feragola May 11, 2010

    There are several things that need to be answered before we can get to the low pressure question.

    On your well tank there should be a gauge that should show you the water pressure. Often the gauge can be stuck so you may need to tap the top of it and see if the needle moves at all, record the pressure that is shown.

    Next, open a faucet in the house, doesn't matter which, and return to your well tank. You should see your pressure drop down and then the well pump should activate and the pressure will go back up. The time that elapses will depend on how large the tank itself is but should not be more than a few minutes. Keep an eye on your pressure gauge during this time and record the pressure that your pressure switch activated the pump. If the gauge is not working properly, it may not move at all and will need to be replaced.

    A few questions here, when you pump activated, what was the elapsed time that it was on while it was filling the tank?

    Did it run for 15 seconds or more or did it run for a few seconds and shut off and then start up several seconds later and run for a few seconds and shut off?

    If it ran for a few seconds and shut off only to start a few seconds later, your well tank may have a faulty air bladder. This condition causes the well pump to "Short Cycle" and will result in accelerated wear on the pump itself. Your well tank will need to be replaced. If this is not the case, lets move on to a few more diagnostic questions.

    Does your pump activate when there is no water running in the house? If it does, the check valve on the inlet line may be faulty.

    Finally, what was the pressure that your pump activated initially, and then what was the pressure that it shut off? This is assuming that the pressure gauge is working.

    If the gauge is faulty and you cannot see the pressure and you tank is not "Short cycling" it may be that your pressure switch may need to be adjusted or replaced.


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A pump will help you

Posted on Dec 12, 2008

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Hi jennym123,

I'm Harvey the Master Plumber.

Your question is: You have a reverse osmosis water filter. The other day water production went from over a gallon of filtered water to 3/4 of a cup. You changed the filters thinking that may be the problem, but that did not solve anything. What else could be wrong with it?

This is a common problem. Can also be very frustrating. A small bit of debrie has been brought up by the flowing water and is stuck somewhere. As you can imagine this will restrict the flow. I would start with the on/off valve next to the cold water line first. Turn the water off first and take it apart checking for obstructions. Then work your way down checking the lines and any place you can. It's helpfull to have a bit of wire to probe with. If you turn it back on and the problem still persists then you missed it. Try again. Good luck.

Feel free contact me again!
Please give me a rating here at fixya before you sign off
Thank you,
Harvey your Master Plumber

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