When you have a very dirty or algae infested pool, it will consume chlorine like crazy. What you probably need to do is test and add more often. 3 times a day is acceptable, but more is better. Test and add what's needed. I'd steer clear of the powdered shock, especially with your 400 hardness, and just use bleach or liquid shock. Get your chlorine to 15 and add as needed to keep it there for a few days. You need a good test kit to monitor this.Originally Posted by geneskaf
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