New to the pool world. We have brown sand with redish particals on the bottom of our pool (intex ultra frame 24X12 rectangular Sand filter and SWG.) Water is crystal clear and we are working on lowering the PH and stablizing the FC. Once we got the vacuum figured out I cleaned the bottom. about a 1/2 hr. later we seen that it had returned. not as much but none the less it returned. Any ideas as to the cause? scooped it out with my hand it is for sure gritty sand and it is not slimmy. Any ideas. Thanks inadvance