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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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  • 33 Answers

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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Posted on Jan 02, 2017

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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

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

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

1 Answer

How to open pool, fill sand filter with water?


I happen to have a copy of the users manual for this pool filter. These are the instructions for operating your filter.

1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
2. Depress Vari-Flo control valve handle and rotate to
BACKWASH* position. (To prevent damage to control valve
seal, always depress handle before turning.)
3. Prime and start pump according to pump instructions (be
sure all suction and return lines are open), allowing the filter
tank to fill with water.
WARNING: ALL SUCTION AND
DISCHARGE VALVES MUST BE OPEN WHEN
STARTING THE SYSTEM. FAILURE TO DO
SO COULD CAUSE SEVERE PERSONAL
INJURY.
Once water flow is steady out the waste line, run the pump for
at least 2 minutes. The initial back-washing of the filter is
recommended to remove any impurities or fine sand particles
in the sand media.
4. Turn pump off and set valve to RINSE position. Start pump
and operate until water in sight glass is clear—about 1/2 to 1
minute. Turn pump off, set valve to FILTER position and
restart pump. Your filter is now operating in the normal filter
mode, filtering particles from the pool water.
5. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten
connections, bolts, nuts, as required.
6. Note the initial pressure gauge reading when the filter is
clean. (It will vary from pool to pool depending upon the
pump and general piping system). As the filter removes dirt
and impurities from the pool water, the accumulation in the
filter will cause the pressure to rise and flow to diminish.
When the pressure gauge reading is 8-10 PSI (0.55-0.69
BAR) higher than the initial "clean" pressure you noted, it is
time to backwash (clean) the filter (see BACKWASH under
Filter Control Valve Functions.)

Apr 16, 2010 | Hayward SAND FILTER, PRO SERIES

3 Answers

Do I need a new sand filter psi gauge?


Your sand needs to be changed as it is clogged up with crud

Jul 07, 2009 | Hayward SAND FILTER, PRO SERIES

2 Answers

My pool pump pumps water, return is low pressure


fix any air leaks on suction side of pump. Check valve positions.
Clean filters...may need to replace cartridges in cartridge filter, or take out D.E. grid assembly and clean it on a D.E. filter, or change sand in a sand filter...

Mar 26, 2009 | Pool & Spa

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