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I see de shooting out of my returns when I add de after backwash. I noticed my bulkhead gasket is missing. I am hoping it's the gasket, but I guess it could also be a tear in the grids. Thoughts?

30,000 vinyl pool. Pool store says I have 10 ppm of cya, I added 8 lbs of stabilizer at open (6 weeks ago), and have been using trichlor to get my cya level to around 40 around 15 lbs this year. I also use bleach to shock at night. Why would my level be 10 ppm of cya after adding that much...