Manual Air Relief Valve..When To Relieve Air Pressure From A Sand Filter..

by Eva

Need to know when should I relief air from sand filter.

Last Friday my filter's top poped up and almost quater of my pool water wasted.

What could be the reason? This happend to my filter two times.

The pool filter is just one year old.

Thanks for the question Eva

Relieving the pressure on your filter is obviously important. When you have lots of air in the system, the air will find the path of least resistance. Many times it's through the top of the pool filter or the lid on the filter pump housing.

Swimming Pool Sand Filters

Pool Sand Filter Maintenance

Pool Sand Filter Problems

Here are the most common times you'll want to relieve the air pressure:

1. After cleaning out the pump basket

2. After backwashing

Remember sand filters do better with a little (mid) pressure, but you'll want to backwash when the pressure gets 8 - 10psi over the "just backwashed" pressure.

With normal use, a pool sand filter needs to be backwashed once per month.

Write down the just backwashed pressure on a piece of masking or duct tape and tape that to your filter. This way you won't need to remember what it is.

3. If the water level gets below the skimmer. Keep your water level between 1/3 - 1/2 up from the bottom of the skimmer.

4. If you
need to take the top off the filter for any reason

5. After vacuuming

The hose sometimes partially sits on top of the water and may have a small crack or tear that goes unnoticed. This will allow air into the system.

Check the gasket around the pump lid. Be sure it's clean without any tears or rips. If it is torn or worn out, replace it with a new one. A bad gasket doesn't give a good seal.

Also check the gasket around the filter lid.

Check the plumbing for any signs of air or water leaks.

Here's an easy way to check this:

Turn the pump motor off and close the skimmer valve and open the bottom drain valve all the way. Turn the pump back on. If the pump loses it's prime, you know air is being drawn into the system through the drain plumbing.

Do the same with the skimmer. With the pump off, close the drain valve and open the skimmer all the way. Pump on, then check the pump for air.

The air release valve might also have a very small gasket. You may be able to unscrew it all the way and check it.

When you put in back in, be sure to relieve the pressure because you just allowed air into the filter.

Hope this helps and have a great swimming season.


Click here to read or post comments

Return to Pool Sand Filter Problems .

PSI Gauge Attached To My Hayward Pro Series Sand Filter

by Ron

I had a chump install my in ground pool last year, I am afraid to say. After paying a professional to open the pool this year, I noticed that my PSI gauge was water logged and not registering at all. I went to the pool supply company and purchased a new PSI gauge and self installed with Teflon tape. My question is, there is a START and BACK WASH register - starts at 20 psi - yet my gauge is reading no more than 18 - is this a problem?

Click here to post comments

Return to Pool Sand Filter Problems .

eBooks Are Perfect Desktop & Mobile Device!!

swimming pool care, basic pool care, above ground pool maintenance, inground, salt water

Click Here To Learn How This eBook Can Save You TONS Of Time & Money


Click Here To Learn The Best Way To Clear Up Your Pool 


All Resources In One Convenient Package. Click HERE To Get Started.

Recent Articles

  1. How To Clear Up A Cloudy Pool eBook

    How To Clear Up A Cloudy Pool eBook

    Read More

  2. Pool Float & Sweep

    How do I keep the hose from my pool sweep and the floater from colliding? If I tie the float off where is the best place, and one last if the float is tied off.

    Read More

  3. The calcium hydochlorite will not dissolve in our pool

    The calcium hydochlorite will not dissolve in our pool. It is suspended in the water

    Read More