hi, thanks for the reply. how can I lower the CYA levels? aqua chek strips say around 100.

my FC is high at 10 now after taking your advice from here:
http://www.poolforum.com/pf2/showthread.php?21881

I raised the ph to 8 with soda ash. alkalinity stayed the same. i will try the borax now because algae isn't gone.

i use a dpd test kit with taylor chemicals to test for cl and ph.