Because chlorine was hard to find I decided to not deal with keeping the pool clean in September and October. I started back shocking in mid November and I have been able to find more chlorine. I can finally send the last step and I can see the brush when I'm using it in the deep end. The water is cloudy but I'm noticing alot of sediment or dirt at the bottom of the pool in the shallow and deep end. After vacuuming I noticed that it looks like sand. Is this just dirt collected from being a swamp so long or is this a bigger issue?