Low Water Pressure From The Return

by Angie B.
(Lancaster, Ky)

I changed the sand in my filter for the first time, after having the pool and filter installed 8 years ago.

The local pool store demonstrated how to properly remove old sand and laterals. Everything was fine but a few hours later I noticed the water in the pool was barely circulating.

I back washed and rinsed and the pressure went back to full strength/normal. Then a few more hours it happened again after doing the process again it is ok. Have never have pressure return problems.

Please help.

Thanks for the question Angie

When you put new sand in there's going to be settling and a loss of sand through the returns. You may need to top it off after this happens, but it's very easy when you know the freeboard. This is the measurement in inches from the top of the sand to the top of the filter. The sand filter manufacturer should know this and/or you can check your owner's manual.

For low pressure issues you can check these tips out:

Check the pump lid O-ring and replace it if it's cracked or broken. Lube it with a silicone based lube. Also check the pump basket for holes or cracks. The pump impeller might be clogged up.

Low pressure normally indicates a block or suction leak:

- Skimmer basket should be empty and clean

- Clean the pump strainer basket

- Leak at the suction side of the pump

- Low water level. Keep it between 1/3 - 1/2 up from the bottom of the skimmer.

- Stuck skimmer weir (the little door in the throat of the skimmer) is stuck in the up position and must be freed

- Pump lid O-ring (as above)

- Pump impeller is clogged. Turn off the breaker, then the pump motor, remove the pump lid and the basket. Stick your fingers in the impeller and remove any debris.

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Sand Filters" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of $29 per hour and I'll answer your questions by phone.

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Have a great Summer.


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Aug 31, 2016
Not much pressure in pool
by: Emanual

I just replace the sand and the pipe that connects to the multiport inside the sand filter because was broke and sand was getting in the pool but now when I start the pump the pressure on the return line is great but after 30 minutes is barly anything coming out I check everything no bubbles in the pump, no leak, water is about half way on the skimmer I don't know what to do.

Jun 03, 2014
Low Pressure On My Return Water
by: Anonymous

I have a sand filter, and I just replaced the sand this season. The pool was running awesum, and then I vacuumed it and my return water pressure is low, what could the problem be.

I have disconnected every hose to check for clogs. I even took the top of the filter off and put the garden hose down the filter pipe and all the warm water from the bottom of the filter started coming up to the top where I could feel it.

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