Small Crack in sand filter

No. The sand filter housing is a pressure vessel. You do not repair pressure vessels.

This should be taken out of service and replaced.
 
Hayward is a good company that stands behind their products. In my opinion, the filter failed prematurely and it should probably be replaced. The tanks probably don't cost that much to make. They're just injection molded plastic. Shipping probably costs more than the part.
 
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