Pentair CCP520 - Pool filter leak

I think you have a new filter in your future. If you have 1 crack like that, you may have others, but not noticeable yet because all pressure is being relieved through that crack.

When it comes to pressure vessels, it is always best to err on side of replacement vs. repair, especially fiberglass type of housings. I think it is actually fiberglass reinforced polypropylene.
 
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