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Old 07-03-2013, 10:38 AM   #1
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Cistern Pressure Tank/Pump Setup


I currently have a 20 gal pressure tank with a 1/2 hp pump and have major pressure fluctuations in the house when different fixtures are running. Eg, if the basement cold tap is running, it virtually drops all pressure in other taps in the house.

I realize this could be related to a number of issues with the plumbing, however I'm wondering if there is something that could be plugged from the cistern.

Any thoughts?

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Old 07-03-2013, 11:07 AM   #2
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Cistern Pressure Tank/Pump Setup


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Originally Posted by ldogg View Post
I currently have a 20 gal pressure tank with a 1/2 hp pump and have major pressure fluctuations in the house when different fixtures are running. Eg, if the basement cold tap is running, it virtually drops all pressure in other taps in the house.

I realize this could be related to a number of issues with the plumbing, however I'm wondering if there is something that could be plugged from the cistern.

Any thoughts?
Not likely, but diffinately make sure it's not plugged or clogged. I would start by checking your pressure tank and PRV (pressure reducing valve) if you have one. Possibly the bladder in the tank maybe bad or going bad. PRV may need cleaning, adjusting or replacing if you have one. Take a couple of water pressure readings from different spots in your home with a water pressure gauge to verify. Check the psi charge on your pressure tank. If water comes out, it's bad and you'll need a new one.


Last edited by jmon; 07-03-2013 at 12:14 PM.
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Old 07-03-2013, 01:45 PM   #3
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Cistern Pressure Tank/Pump Setup


If the pump turns on as soon a tap is opened then you have an issue with the pressure tank.
That tank needs to be set at 2 PSI below the high shut off point of the pump.
It's filled with the pump off and pressure tank drained.
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Old 07-03-2013, 05:31 PM   #4
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Cistern Pressure Tank/Pump Setup


Pressure tank is your problem.....
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Old 07-03-2013, 06:47 PM   #5
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Cistern Pressure Tank/Pump Setup


Yes, check your pressure tank. It's easy and any DIYer can do it right at minimal cost.

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