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I've attached a link to a Youtube video. The first 10 seconds is what I consider my pump sounding relatively normal (even though there is a bit of a high pitched noise). The second 10 seconds is where it is sounding extra annoying. It is only my second season using this pump. Here is a...

Hi, Could someone please explain (by showing me the math) how this is actually calculated. Ex. If my pool (41000L) has a TA of 104ppm and I want to increase it to 150ppm, the calculators say I need 3.3Kg of Sodium bicarbonate. HOW IS THIS CALCULATED? Thank you. OR why 680g/37854L pool will...

Hi everyone. Can someone provide a CHEMICAL explanation for why increased CYA levels require MORE free chlorine that the recommended 1-3ppm? It doesn't make sense to me why chlorine/hypochlorite would stop working in the presence of elevated CYA. I've watched the videos, read all the...