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What does it mean when my pool filter is at 0 PSI, but everything seems to be functioning fine?

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J Bloodsworth

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Pressure gauge failed, replace it

Posted on Nov 25, 2020

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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

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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

1 Answer

I have a hayward s166t filter, guage reads 0 and sight glass water does not swirl when backwashed


Does it show pressure when in "Filter" mode?

If not, then your pump is either not primed, Impeller is plugged, or there is not enough water in the pool, you are sucking air.

Jul 18, 2013 | Hayward S166T Pool Filter System w1 HP...

1 Answer

Pump stops suction when I try to vacum pool


1. Something is stopping the seal at the basket
2. The hose going to the filter housing is partially clogged or not sealed
3. If you have a 2nd filter basket before filter housing, clogged/not sealed
4. Filter is clogged and needs to be cleaned, not just dirt, but degreased
5. Leaking pressure valve if one is used

I had a large filter and regular pressure was well above 5 psi, (8 to 10psi) with everything cleaned and running, once vacuum hose was connected it jumped to 14 to 18 psi.

May 05, 2012 | Hayward 1 12 Hp Super Swimming Pool Pump...

1 Answer

My new ec50 is clogging frequently. Is at 18 psi


lower the better (psi) this means the water is flowing fast through the filter, high pressures means it's time to clean filter again. keep cleaning until the pool is squeaky clean, then you can go back to cleaning once a week
Jay the pool pump motor repair guy Longwood Florida

Jun 15, 2017 | Hayward EC50 SYSTEM W/ 1 HP MATRIX PUMP...

1 Answer

My pump pressure is 10psi i cleaned the de filters they seem fine i have good floe out of my jets but when i hook the pool cleaner up pressure drops to almost nothing. could my impeller be the problem


The pressure you are reading is the pressure in the filter tank as water is pumped though it. When the filter is freshly charged, 9 PSI is a good pressure.

As the filter removes particles from the water the filter gets "dirty" -- it takes more pressure to push the water through it thus raising the PSI.

I think you are viewing this in reverse. Low filter pressure is "good" (as long as it stays above 8 PSI) -- as the filter cleans the water the PSI will increase -- when it gets to 15-20 PSI it needs to be back-washed and recharged.

The pressure drops when the pool cleaner is connected because pool cleaners always pull in air (in varying amounts) because of all the hose connections. This causes your filter/tank pressure to drop.

May 25, 2009 | Hayward 3/4hp Super Pump Inground Pool...

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