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will low CH help calcium scaling... I've got classic calcium scaling, greyish tint that only shows up in certain light but was obvious with the pool drained.... I just refilled and have extra low CH, will leaving that low for a while eat the scaling or the plaster first?

I've got about a dozen minor rust stains.... small curling lines in shape... my area / pool has high CH around 400 ... I used a masonry finishing stone to rub one of them out, which worked but now there is a area of diamond brite that is a couple of shades whiter than the rest of the pool...

new guy... pls be nice... so for years I've got a grumpy expensive pool guy and then can him last Nov... I read up here some... get a dangerous level of knowledge and dive in... 1- time goes by and suddenly here in south fla the temp goes up and chlorine usage goes high quick... 2- yesterday...