I am not exactly sure what is going on, but it sounds like you may have had water mold. Water mold takes mega doses of chlorine to kill it. I would take my chlorine up to 20ppms and keep it there until it holds overnight (not losing more than 1ppm) It could also be just dead algae that will take a while to filter out, but lots of chlorine will break down the dead stuff too. So my suggestions is to add regular bleach to get your chlorine up to 20 and hold it there by testing as often as you can and adding more to keep it at 20 until it starts to hold. Backwash and keep the filter running 24/7 until you have clear water.
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