blue water

The water sparkles in the sunlight, you can see the fine details on the bottom, and it looks clear. But it's ever so slightly blue-tinted such that the walls and stairs look bluer towards the bottom. I don't think it's algae, because my overnight free chlorine loss is consistently less than...

Headline up front: New pool, new fill, no chemicals added, water turned green, R-0870 powder will not turn pink. The full story: Our 12-year old 18-foot round pool rusted through and collapsed in September 2020 and snapped about one-half of the 1.5 inch PVC piping. Finding a new pool was...