If there is a precipitate in your water, your sand filter won't filter it, as is. The precipitate could be caused by metal/s in your water, of which there may be many. I am hoping someone with more chemistry knowledge will come in and speak more to the cause of your cloudiness, but here are some things you can try now.
1. Add some DE to you sand filter. This will improve your filter's ability to capture smaller particles, though that still probably won't be enough to stop the cloudiness. There are great instructions on this forum for how to do it, follow them to the letter.
2. Add some polyquat algaecide, which is the only algaecide this forum recommends, generally. It also acts as a clarifier, clumping particles together into bigger particles, and then your DE laden sand filter might be able to grab them better. If the cloudiness is being caused by algae, the polyquat can help with that too.
All that being said, if the cloudiness is due to metal precipitate, I am not sure any of the above will help. There is a procedure for using a sand filter to filter out calcium, but I do not know it, hopefully someone else will chime in.
All that being said, again, if your numbers are good and you are swimming, and your water looks relatively good, why worry? I am a big fan of clear water, don't get me wrong. But let me ask you, why do you have a swimming pool? Is it to swim in it, or impress the neighbors? If it were me, I would try the above, and if that doesn't work, don't worry too much about it.
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