It is not unusual to add 3 quarts per evening. I have a 24 ft AG (approximately 13,500 gallons) and I typically add 2 quarts per evening and my cya is around 40ish. (Sometimes I add 3.) With your increased volume, I don't think 3 quarts sounds excessive.

Reply With Quote
. I really don't want to change my sand. The water is crystal clear and I would rather spend the money on bleach.