I'm a little confused here because I think my 9500 gal above ground pool should be clear but it isn't. Here are my numbers:

Cl--10
pH--7.3
Alkalinity--120
CYA--20

I've vacuumed and backflushed until there's virtually nothing left except little bits of algae that blow right through the sand filter. Cl level has been kept in the 10-20 range continously for the last 4 days. Last night Cl only dropped from 12-10 overnight so it didn't use much. I brushed the bottom before nightfall thinking the Cl would be more effective if the algae is dispersed through the water. This morning I can still barely see the bottom of the ladder. Am I missing something?