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Tried the test you recommended. It seems that this is algae after all. Tested the water: total alk:101.00ppm; pH: 7.30; temp: 89.1; Cal H: 203.00 ppm; FC 2.53 ppm; Stab: 75.00 ppm. What are your suggestions?

This is my first post with this group. I had stains appear during the winter. Pool center said high in minerals. As a result of several conversations, we disconnected the ozone system and Nature2 system. Changed the sand. Water is clear but stains won't leave. When I add shock the stains go to a...