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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!
They are fiberglass ... fiberglass repair kit should do it ...
Im not so sure I would fix it ... if it is broken ... there are probably problems you cannot see ... might be cheaper to replace the tank when you consider what might happen if it breaks while you are not around.
First if it isn't cracked you should be able to remove the screws from the top and replace gaskets inside. There are two types the clamp ones and the threaded ones. The threads get difficult with plastic on plastic (or fiberglass) and sand in the threads. If it is indeed no longer of any use, thread a piece of 1-1/2" pipe in the vale openings. Apply some type of lube to soak into the threads. Get an assistant to hold the filter , while you use that pipe as a large wrench to remove valve. REMEMBER LEFTY LOOSEY. That valve will be rather expensive,and not easy to locate. Try repairing it first.
Thank you for posting your question here on Fixya.com. You need to empty the sand out and replace the lateral assembly too. It attached to the bottom of the valve and has several 'fingers' embedded in the sand. Once it wears enough, the sand can get thru it. Replace the sand if it is over 3 years old while you are at it. A wet/dry vacuum works well for removing the sand. If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved! John
You can try different epoxy's but they usually won't hold as the filter expands when running this will break any seal where you put it.You can check into warrentys. A lot of these filters had good warrentys on the tanks that went longer than valve or internal's. if you have install dates and model #'s. Check on line with Hayward. http://www.haywardnet.com/inground/products/manuals.cfm
Worse comes to worse you can drill out a small hole amd using stanless steel go with a bolt and nut with washers and rubber washers in the middle. when you set it seal it all with silicone and after it is tight let it set for eight hours or so. Good luck.
If it is sand in pool you may have a broken ladderal inside the filter. Big job to fix. Call a pro. If it is just silt and fine dirt you may be able to help this by putting a small amount of DE into the filter and it will clear up most fine dirt. If not your sand may be clumping and should be replaced or a new filter may be in order. Once again big job and time for a pro. The out look is not good. Sorry.