Hello, and welcome to the forum!!
First off, don't put anymore clarifier or floc into the pool. They have their place--but it's usually as a last resort and I don't think you're there yet. Go ahead and run a test for calcium hardness--you don't necessarily need it in a vinyl pool, but if your level is too high, it's one of the things that can cloud your water. What form of chlorine do you usually use? Do you have a pressure gauge on your filter? Is the pressure rising as your pump is running, and when you backwash do you see dirty water? How high are you letting the pressure go before you backwash? (Remember that a dirty filter will filter much better than a clean one--you only need to backwash when your pressure is 8-10psi over your "clean" pressure.) Do you see anything blowing back into the pool from your returns? What size pump and filter do you have?
There is another trick you can use with DE to help a sand filter work better--but let's start with the answers to the above questions before we go that route......if you don't have a working pressure gauge on your filter, your next step is to get one!!
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