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Either broken lateral drain assembly or the manifold.
If fairly new filter, it could be that you have overfilled the amount of sand, as it is too close to the bottom of the variable position Multiport filter valve. Hayward SX244DA Lateral Assembly With Pipe
If the tank is cracked, you most certainly need to replace the whole thing. This should be covered under warranty and the local Hayward Warranty pool guy should be able to take care of this for you. Call one of the pool supply stores in your area and they should be able to direct you to the local warranty person.
A Hayward S180T sand filter holds 150# of sand. In other words, fill the filter 3/4 full of sand (to the point where the tank starts to round off). Make sure, however, that you fill the tank 1/2 full of water first. This will help to cushion the laterals and prevent them from breaking from the weight of the sand. Make sure to cover the hole in the top of the lateral assembly pipe with a cup or duct tape to prevent sand from going into the pipe. If sand gets into the pipe, it will come out into the pool. Don't forget to remove the cup or tape after adding the sand!
When sand returns to the pool, there is a hole in either the media or the sieve that is supposed to keep the sand in the filter.
All of the sand must come out of the filter, the sieve at the bottom (outlet of the filter) must be removed and any broken segments must be replaced.
The sand is then returned.
Gary
Thank you for posting your question here on Fixya.com. The 'manual' for their multiport valves, found here, shows the layout of your settings. 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
O-rings or gasket are replaced to stop leaks, so that wouldn't have helped you.
It could be one of two things; either the white PCV-like pipe in the filter tank is cracked OR some of the laterals at the very bottom of the tank, under the sand, has melted. A whole new underdrain assembly is usually $70.
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