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What is normal pressure at pool sand filter when pump is running?

New house, old pool. Gauge at sand filter was not working and was replaced. What is normal? Showing about 12 psi. Approximate 18000-20000 gallon pool using a jacuzzi magnum 1HP pump. Also, where do I find a manual on the pump?

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  • Anonymous Mar 21, 2014

    At the low pressure turn on, 38 psi, the pump starts, runs for a few seconds, then stops for 30 seconds, then repeats the cycle. After the second or third attempt, the pump runs normally until normal stop, 55 psi. 3 wire 3/4 hp pump.

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This is normal pressure! As the filter becomes more dirty you will see the pressure get higher 15/20 it's time to backwash!

Posted on Jan 27, 2009

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2 Answers

My haward sand filter is running at about 20 psi is that normal


That 20 PSI does not mean anything to anyone that is going to help you. Every system will have its own "Starting Pressure". It all depends on how it is plumbed, what equipment is included (size and GPM), how big the pool is will address the issue of how much plumbing is involved, total feet & amount of fittings, valves, etc (mainly elbows create more restriction, raising the overall PSI, and if a Solar System is involved?

So, is 20 PSI normal, if you have a Solar System in an average inground pool in the backyard, then that could be about normal? If you have an Above ground pool with only a pump & filter, then that could be pretty high over normal.

The best thing is to backwash your filter very good, if possible use a sand filter media cleaner, available in most Pool/Spa Retail Stores. Follow the instructions on the label and proceed with the cleansing of the sand (media). Then when you turn everything back on to normal filter mode after the cleansing, make a note of the pressure! This will be "Your Systems" starting pressure. Take a "Sharpie" and write that number right on the filter tank. When the pressure climbs to 8-10 lbs over that starting pressure, backwash.

Jun 27, 2014 | Hayward SAND FILTER, PRO SERIES

1 Answer

My inground pool filter guage is fairly new and registering 0 even though pool seems to be running fine


if you are sure water is circulating (check to see if water is being sucked into the skimmer suction port or you can open your air relief valve on top of your filter and water squirts out,) then you will know that all works, but if pressure gauge is "0", then replace your pressure gauge.

May 24, 2014 | Hayward SAND FILTER, PRO SERIES

3 Answers

My hayward sand filter pool guage is registering 0 although the pool seems to be running fine. Guage was just replaced last summer.


  • Those spring type gauges break constantly, most likely broken again, they cost a couple bucks extra but liquid filled are much more durable, just don't forget to remove if you live where it freezes.

May 24, 2014 | Hayward SAND FILTER, PRO SERIES

2 Answers

Pressure psi filter


Is there water flowing into the pool? If the flow is there it may only be that your gauge is stuck. If not make sure the pump pot (where the basket is by the motor) is full of water before starting. If the pump has water + is running + no psi showing + no water flow, then you likely have an impeller issue. The pump needs to be opened up to see if the impeller is clogged or broken.

May 29, 2013 | Hayward SAND FILTER, PRO SERIES

1 Answer

Lost high pressure to spa jets. Pump running , gauge on sand filter shows 30psi ?


backwash and try again if sand is over 3 years old replace but try on recirculate if ok you have a filter problem that I told you about if still no pressure see if impeller is plugged

Apr 22, 2013 | Pentair 1.0 Hp Whisperflo Pump

1 Answer

Pressure gauge not working


Is the unit filtering? Is there pressure and flow at the discharge to the pool? Is there suction at the skimmer? Is there movement at the basket strainer? If you answered yes to all these questions then replace the gauge.

May 23, 2012 | Hayward SAND FILTER, PRO SERIES

1 Answer

What to do about 14 psi ?


The actual pressure depends on how clean the sand is, how well the pump is pumping, how clean the skimmer and pump baskets are. The rule of thumb would be when the filter pressure raises 8-10 psi above whatever the pressure was when you first started the filter with clean sand, clean baskets, good pump, When it reaches the 8-10 psi, it's time to backfulsh. A low pressue, with adequate return flow is what you really want. See Hayward's web site for a manual. http://www.haywardnet.com/inground/products/manuals.cfm

Jul 06, 2010 | Hayward SAND FILTER, PRO SERIES

1 Answer

Filter pressure is 0


I'm assuming the pump runs, and the water is circulating from the skimmer back to the pool. Do have the pump running when checking pressure? Second be sure "filter" is selected on multi-port valve. Third, remove gauge with pump off and test gauge with compressed air and be sure gauge is working (don't overpressure gauge depending on gauge scale) If gauge is defective replace. If you still have no pressure on gauge, you might be "bypassing" the filter media (sand) due to a broken pipe from the bottome of the multi-port valve. You sould still see some pressure though as your pump should have some back pressure to the pool.

Jul 04, 2010 | Hayward SAND FILTER, PRO SERIES

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