I’m not pool maintenance expert but I did own a house with a pool (much smaller than yours) a few years back. The water pH and alkalinity have a lot to do with the effectiveness of the chlorine or any chemical you put in. The more often you use the pool the longer you run the filter and more chlorine tablets you add.
If you live in a warm climate and the pool is covered in shade, or if you use a solar cover, then you will likely have algae problems. If it’s to a point where shock treatments won’t revive the water, drain it, scrub it and thoroughly clean out the filters.
I was able to keep the water clean / clear up until we sold the house, I’d say about 6 or 7 years. You might want to have someone access the damage and see what solutions they offer.
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