Hello - I've been reading the site for about a week now - this is such a great site; so supportive and helpful. We've had a pool for about 7 yrs, but I just started taking care of it recently - I want to learn how it works. I'm most interested in the BBB method, which is really interesting.

Here's where I'm at right now:

--pool burning thru chlorine (I think former pool guy added too much of something, after a big storm)
--no algae; water nice and clear
--tried adding some bleach last week (for first time), but couldn't keep chl up (11,000 gal pool)

--Sunday PM: added 2 gal bleach
--Monday AM: chlor was about 3 ; pH 7.6-7.8
--Monday PM: chlor .5 (at best); pH 7.6-7.8; alk 160-170ish; cya 170

So, is the high cya causing the prob w/ burning thru chlor? If so, what do I do next? If I have to partially drain...I have no idea how to do that...would I have to call someone for that or can I do it myself?

Many thanks for any help!
Ann