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Hi everyone, I've just taken the winter cover off the pool to discover quite an amount of powdery white substance over the pool floor - please see photo. Any ideas what this could be? It's a vinyl liner pool so it's not leached from the grout. For context, I shocked (liquid chlorine) and...

Hi, I'm relatively new to pool maintenance, inheriting an existing pool with our current property in Dec 2015. My sincere thanks to this forum for setting out the FCL/CYA relationship. I had been using multi-function tabs exclusively since the start of the season and my CYA hit 70+, at which...