Replaced Lateral But Still Sand In Pool

by Tim Chapman
(West Greenwich, R.I.)

I had sand in my pool so removed top of split tank on the filter, removed sand, and found the end of one of the laterals in the sand.

Laterals were glued into main body so I glued a pvc cap over lateral so sand couldn't get in.

Replaced sand an reassembled filter.

No more sand coming out of returns.

Two weeks later sand coming out of one return.

Repeated process and found no apparent breaks in laterals.

All are pvc glued so WHERE DO I GO FROM HERE?

Thanks for the question Tim

There could be a few reasons why sand is still going into the pool.

Here are some other things you can consider:

1. Broken lateral and/or diffuser

2. Channeling

3. New sand

4. Old sand

5. Not doing the RINSE after back washing

6. Lateral impacted with sand and/or debris

7. Not having the correct measurement of freeboard

Sand, with good maintenance, can normally last anywhere from 5 - 10 years.

Here's a post to look over:

How Do I Stop Sand Going Back Into The Pool..Pool Keeps Getting Dirty..

Swimming Pool Sand Filter..Pool Seems To Be Manufacturing Small Debris

If you do put new sand in be sure to put the correct number of pounds in and get the correct size sand for your filter.

The freeboard is the measurement from the top of the tank to the sand. You can call the sand filter manufacturer and get the correct measurements.

Sand filters are pretty straight forward. There's really nothing hidden and once the sand is out everything is pretty accessible.

Check the Multiport valve as well.

The spider gasket may have gone bad or is crusted up or the compression plate and compression spring might be going.

You can go to this link to check on that:

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

There's lots of good info. on troubleshooting the Multiport valve, what to look for, and how to replace it, if necessary.

Hope this helps and let me know how it turns out for you.

You can find your post in the "Sand Filter" category in the Q&A page:

Swimming Pool Questions and Answers

Have a great Summer


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Zeosand Putting Sand Back Into The Pool

by Eric
(New Jersey)

I have a Hayward s180t sand filter that was blowing the sand back into the pool and not a little but a lot.

I installed a new center pipe and laterals and put Zeosand in.

I backwashed, rinsed, and ran the filter for about 8 hours. I have sand again.

I am lost what to do besides spend the money for a DE filter. Please help.


Thanks for the question Eric

I'd first direct your attention to this post about a similar issue:

Debris At Bottom Of Pool With Sand Filter Using Zeobrite

That has 2 pages of info. that will be helpful about Zeosand.

Zeosand, or Zeobrite sand is pretty new on the scene, compared to regular pool sand that has been around for decades.

With any new sand you're going to have a settling in period. This is when the sand becomes wet and starts to fill with debris.

All new sand, regardless of the kind, will have residual dirt and debris in it and there's nothing you can do.

It will take some time for the Zeosand to settle down and pack into the filter.

When I changed the sand in the YMCA filters, I had to vacuum twice a week for a couple of weeks before the sand settled in.

After that I checked the filter media to be sure it was at the correct height.

This is known as "freeboard" and is the measurement from the top of the tank to the sand.

You can call the sand filter manufacturer and get the correct measurements. It may be different with Zeosand so ask about that.

Keep filtering and allow the sand to build up a little pressure and dirt.

This is when they're most effective. And back wash when the pressure get 8 - 10psi over your "just back washed" pressure.

If you didn't break any laterals or the standpipe, then just allow the filter sand to break in a bit.

Each pool filter is different, but an educated guess would be about 5 - 7 days.

Hope this helps and let me know how it turns out for you.

Have a great Summer.



By: Eric
Date: July 10, 2011

Robert thank you so much for a quick response. Your email made a lot of sense and eased my stress.

I will definitely read the link you attached. I am so glad I found this website.

Once again thank you for your help.

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