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Trim it down with flow off put an urchin in there. Also try turbo snails. Try the natural way before you start messing around with any chemicals. If you can remove rock you can also kill with peroxide
Here’s what I’m using for Calcium if your interested. 2 cups of Prestone Driveway heat purchased from Lowe’s to a gallon of water. This is from Randy’s 2 part. Been doing for a year