I have a lot of stains that are covering most of the bottom of my pool. I’ve tried vitamin C with no luck. I thought there was an article on here about how to do the process to get rid of them using Ascorbic acid. Does anybody know where that is at? Also, I’ve got different types of stains and they’re different colors. The ones that bothered me the most are the ones that seem to be spreading all over at the bottom of the pool. Got my shock level real high and brushed so it’s not algae. The stains will not come up. Any advice would a picture help? Thanks