So I joined last week and been reading posts as I have time. My pool used to be green and cloudy. This season, it's been better, only accasionally cloudy, usually after I brush it or it gets heavy use. Some backgound - plaster is rough, not smooth, black algae present and hard to eliminate; pool is about 40 years old; replaced the pump and DE filter about 6 years ago; been using dichlor and trichlor (tabs) for many years; pool has never been drained.
Starting this week, been using bleach (10%), takes about 1 gal every two days. Water is unusually clear now. TF100 Test Kit on UPS truck for delivery in a few hours.
In the meantime, been using old trusty (?) OTO.
TC varies from 0 to 3 (depending on when bleach is added),
pH is about 7.0 (after adding 5 lbs of soda ash). After reading in this site, figured my CYA was sky-hi. Had pool store test yesterday. Sample was 50% pool water, 50% well water. CYA was about 120 or 130 - so doubling that would put it at an extremely high number. Not sure it's valid but the best I could do until later today.
Will post my numbers later today in this thread.
Decided I really needed to bite the bullet and replace water, so am draining as we speak.
Finally to my question. As long as the sides are exposed, how do I (or should I) scrub the plaster to attack the black algae? What chemicals are recommended.
And a big thank you for this site and to all the admins and moderators and members. I like it so much, I just became a platinum member.
News at 11. -Kevin-