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Hello. I am wondering why the variance in ranges between the Pool Math app and the National Swimming Pool Foundation (NSPF)? I’m trying to understand the logic, not trying to sharpshoot. I’ve noted the differences below, and I’m interested in why TFP makes the different recommendation levels...

Background info: I had a pretty bad storm early this morning. A lot of runoff dirt and debris has gone into my pool during the storm. I am currently skimming what is floating on top, vacuuming the pool, and intermittently backwashing the sand filter (to both clean out the filter and to empty...