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Removed all old sand from filter put new sand in but getting lots of sand in the pool

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When removing the old sand, you have to be extremely careful not to break any of laterals at the bottom of the tank. Also, when you added the sand, you should have filled the tank with water at least up to the lateral assembly/hub. If you have not broken a lateral and filled the tank with water up to the laterals before adding the new sand, you could have a problem with the multiport valve. Make sure the spider gasket inside is in place and not damaged/deformed. Also make sure the spring is not broken. Those are the only problems you can have with sand returning to the pool.

Posted on Sep 16, 2010

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Too much sand or wrong type of sand in the tank are two possibilities; should tell you on the side of the label how much sand to put in but generally it fills to about half way up the tank body.

Are you getting sand back in the pool at all? If not it is unlikely the sand is the issue since too small a grain would pass thru the laterals and get to the pool.

Have you used any clarifiers in the water? Over-dosing with a clarifier can literally turn the top of the sand bed into mortar impeding the flow of water.

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Sand Leaking From Filter into Pool. When my filter is running I am experiencing sand in the bottom of my pool from the filter. What can be causing that?


There is only one thing that can cause sand to come back into the pool from a sand filter. The internal assembly, called the lateral assembly, is either cracked or broken. This is an easy fix and should cost you around $70 to replace the whole thing. You need to unscrew the bottom drain cap on the filter to remove the water in the tank. Then, remove the multiport valve on top of the filter. Take a shop vac and remove the sand in the filter. If the sand hasn't been replaced in the last 3-5 years, this would be a great time to do that since you already have the sand out anyway. Then, remove the lateral assembly and inspect the entire thing. After you replace the lateral assembly, you'll need to fill the sand filter tank 1/2 full of water before adding fresh sand. This is done to cushion the laterals from the weight of the sand. Cover the hole in the top of the lateral assembly pipe with a cup or duct tape to prevent any sand from getting inside the pipe (the sand will come out into the pool if it gets into the pipe). Fill the tank 3/4 full of pool filter sand. Make sure it is genuine silica pool filter sand from a pool company. A lot of big box and home improvement stores sell play sand as filter sand. This will cause you more problems!

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There could be a few things causing these problems. How old is the sand in the filter? Filter sand looses its filtering ability after 3-5 years and needs to be replaced. If the sand needs to be replaced, make sure you get actual pool filter sand. A lot of big box and home improvement stores sell play sand as filter sand. That will cause your pool to stay cloudy and never clear up. If the sand is less that 3-5 years old, you may need to clean it with a liquid filter cleaner that is poured through the skimmer. This works quite well!

Another issue causing the cloudiness and bubbles could be the type of chemicals you are using. I know that shock from big box and home improvement stores cause the water to be cloudy. Algaecides from these stores also cause foaming.

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Lots of sand? You may have a broken lateral in your filter.

To repair, you will have to remove all the sand from the tank to physically inspect.

Might you have changed the sand this year? (top 1/3 needed to be changed every 3 to 5 years normally) If you changed the sand ... did you put water in the filter tank first? If not ... there is a good possibility you broke a lateral (a small pipe with slits in it) when you put the sand into the filter.

It could be that you have too much sand in the filter. Check the owners manual for the clearance - top of sand to top of filter.

Thanks for your interest in FixYa.com

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If sand is returning to the pool, the most common cause is the laterals, or the internal pipe is not connected to the valve properly.

If you have laterals with "slots" on one side and solid plastic on the other side, the slots have to be installed so that the slots face downward, toward the bottom of tank. If one, or more, are facing upwards, you are pulling sand right into the pool. If you have the newer laterals, with slots on all four sides, one, or more, may not be tightly in place.

If you have too much sand in the filter, that could cause this issue also. Pentair recommends using the #20 Standard Silica Sand in the filters.

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