Bad Water Comes Back into Pool When I Vacuum

by Sara Stretch
(Alpha, NJ U.S.,)

I have a Hayward E-series pool filter. When I vacuum my pool, the bad stuff comes right back in through the jet.

I replaced the sand in the filter, and I didn't see anything wrong with the laterals either.

What could be the problem?

Hi Sara.

Sand filters clean dirt particles down to about 60 microns, anything smaller than that will blow right through. Some types of algae will do just that, they will blow right through a sand filter and back into the pool.

You need to remove the algae from the pool by using an algaecide or a shock treatment. Once the algae has been treated it's best to vacuum it out in the waist position on the filter. This gets it out of the pool, not to return.

If you are not sure what to treat the water with you might be better off taking a water sample to a few different pool stores and get their opinions. I recommend a few different opinions because pool stores love to sell chemicals and some will try to sell you a lot more than you need.

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Aug 01, 2010
Bad Water
by: Cody

I would like to thank you for this answer and question because no pool place has been able to fix my problem.I had the same thing happen and after all the chemicals and replacing the multi-valve and the sand it still did the same thing.I went to two different pool stores and they could fix the problem.When I ask a stupid question about just bybassing it to waste they said it would be defeating the purpose of the filter. But guess what five minutes after reading this article I vacummed my pool on waste and it is now pool time.Thank you a Million!!!!!!!!!!!!!

Jun 02, 2011
bad water comes back into pool when i vacuum
by: Anonymous

When you vacuum to waste do you have the pump running?

Yes, you sure do.

Aug 12, 2011
by: Anonymous

I have an Intex Pool and this same thing is happening. I'm not sure if there is a vacuum to waste button. I will check tonight. If not does anyone have any ideas on how to fix this problem with an Intex pool? Thanks!

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