How brown is brown?
When our pool was being built they installed the lights after the water was in and they found that a conduit was blocked with concrete and mud - which they blew into the spa. The floor of the spa was like a pig sty it was so thick with mud on the bottom and it took our filter about 2 days (48 hours with the pump on consistantly) to clear out the sediment in the water. We had to manually vac VERY slowly to get it all off of the bottom though without it kicking it back into the water.
Have you tried cleaning your filter medium to see if that helps. We cleaned ours about 4 times in 7 days to clean out all the mud/junk that was in there. Aslo are you using a jet nozzle- not a spray nozzle - they clean the cartridge filters much better!
Can you post a picture?
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