You will need to post accurate test numbers for free chlorine and total chlorine, PH, ALK, CA, and CYA.
It sounds like you have killed most of the algae, however you will not know until you post your numbers and test 2-3 times a day and bring your free chlorine level up to shock level (according to the chart - which will require you to get your CYA level tested).
You will need to run your filter 24/7 and backwash frequently. If it still is having issues filtering out the dead algae you can try adding 1lb of DE into the skimmer - this will sit on top of your sand and help to filter out smaller particles, bu will be washed out when you backwash.
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