Dirty Rinse During Backwash


I replaced my sand this year. My pool water is cloudy and I am working on reducing algae.

When I backwash the water does not produce too much dirt. However, my rinse is extremely dirty. What is going wrong?


Thanks for the question Rick

And it's good that you're doing the RINSE cycle after you back wash. New sand will take a while to settle down. It has alot of dirt and debris which is unavoidable.

It may be that more than normal debris in is the line after you back wash. The new sand will settle in time.

Sand In Pool After Changing The Filter

Why Is Sand Going Back Into The Pool After Backwashing?

Sand Returning Back To Pool After Replacing With New Sand

Hopefully when you were changing out the sand the laterals or stand pipe weren't damaged. This can cause sand to go back into the pool.

If the pump is not being run often enough the dirt can settle in the plumbing. When you're fighting an algae problem the filter will clog up with algae. Be sure you're doing all you can to get rid of that.

How To Clear Up A Green Pool In Woburn

There's also much more information on clearing up green pools on the Q&A page:

Swimming Pool Questions and Answers

Check out the links above because they have much more information on your problem.

Have a fun and safe swimming season.


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Why Does Backwash Keep Running After Shutting Off?

by Sue

After I backwash I turn off and then put on to filter.

The water keeps right on running out my backwash hose.

Why is this?

Also, when vacuuming the pool, the vac head keeps coming off the skimmer and I lose suction.

This pool is 8 yrs old. It has a newer motor, but the sand filter is 8 yrs old.

Maybe I need new sand filter (the big black round thing)

Thanks for the questions Sue

I have answered similar questions about water coming out of the backwash hose in these posts:

Multiport Valve Filter Setting Issue..Water Coming Out Of The Backwash Hose..

Be sure you read all the way to the bottom of the above post. There are other answers that will help you.

No Backwash Or Rinse Pressure On A Pool Sand Filter...

Next, the question says there's low suction in the skimmer. You can check out these posts as well.

This is for a possible leak in the pool:

No Backwash Or Rinse Pressure On A Pool Sand Filter...

Why Is Air Getting Into The Sand Filter & Pump?

This is a very good post about low skimmer suction. Pretty long, but lots of information and troubleshooting:

How Do I Fix Low Skimmer Suction?

Some of the links above have other links in them that will take you to other pages with more information.

Some of the info. might not be part of your issue, such as a vinyl liner or DE filter, etc...

You can skip over that and just look at the skimmer and suction issues.

It doesn't matter if you have a sand filter or DE filter, if the pool is draining or if you have a suction side leak, you troubleshoot pretty much the same way.

Both will have skimmers and weirs, both will have a pump and pump basket, etc...

Hope this helps and if you need more assistance, please contact me again.

You can find your post, "Why Does Backwash Keep Running After Shutting Off?" on the pool Q&A page in the "Sand Filters" category.

Swimming Pool Questions and Answers

Check out that category as well because there's more great stuff you can read.

Hope this helps and have a fun and safe swimming season.


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Pool Pump and Filter High Pressure

by Christina
(West Virginia)

I opened my pool. It's not too dirty and replaced the sand with new sand after backwashing my filter.

It runs good psi and is around 14, but 2hrs or less later there's low suction and low water return back to pool and psi at 20 or above

Backflush again and the same thing happened

And 2nd question is in the top of pot basket... How do you stop water flow from skimmer when you need to empty the basket?

Thanks for the question Christina

It sounds to me that you have high pressure on the sand filter. Here are some good posts to look over:

Sand Filter - High Pressure

Why Does Air Pressure Build Up Inside My Sand Filter?

High Pressure Problem On A Swimming Pool Sand Filter

The first 1 - 2 inches of the sand does 99% of the filtering. If that's clogged up, a good backwash is recommended. If that doesn't clear it, check the impeller for debris. You can also go the degeasing route as well. A good one is GLB Filter Fresh.

Here are some things you'll want to look for:

*Low water levels

*Skimmer weir stuck

*A broken suction line from the skimmer to the pool pump motor

*Loose pump lid or bad gasket

*Loose fittings in and out of the pump

*Worn our pump seal

*Pump motor impeller clogged

High pressure means a clog somewhere or a blocked filter. Low pressure means a suction side blockage, an air leak, or pump problem.

Also be sure you check the freeboard. This is the measurement from the top of the sand to the top of the filter. Your manufacturer should have this info.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

Contact Me


Hope this helps and have a great Summer.


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