algae when running pump

[clrtherp]

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.

[Watermom]

To reiterate some of what Ben told you above:

You cannot trust the CYA results measured with test strips. You need to do a "disappearing black dot" test. If your CYA s high, you have two choices.
1. You can do a partial drain and refill.
2. You can compensate for the high CYA by running higher than normal chlorine levels. (Please read the Best Guess Chlorine Chart in my signature below.)

Although we recommend the Taylor K2006 kit to everyone, if you run a high chlorine high CYA pool, it is an absolute must.

If your pH is 8 (and you cannot trust that reading if it was taken while your chlorine was high) , you do not want to add Borax right now.

If you have algae, you have to get your chlorine up high enough to kill it and it is based on your CYA level. (Again, info in the best guess chart.)