ZeroChlor AFMng Grade 2 (Medium) 27.5 lbs
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This is the AFMng GRADE 2 (Medium) which is usually used by pool owners in large sand filters as the second part of the 3-Stage Activated Glass Filter System. It is installed on top of grade 3 and under grade 1 inside the sand filter body. Filters smaller than 30" do not require grade 3. Filters smaller than 30' will use 50% grade 2 and 50% grade 1.