I have gotten very good a balancing my pool with the BBB method and using a good Taylor test kit.
Over the past 4-6 weeks I could not keep enough chlorine and identified high CYA (~200) as the culprit.
So this weekend I will drain about 2/3rds (or 8000G) of my pool and replace with fresh water.
1. While the pool is near empty should I scrub the areas (like step corners) where little buildups of dirt, calcium and/or algea have set in? If so, what cleaners and method?
2. Anything else to do maintenance wise with the plaster, skimmers etc?
3. After draining - simply refill and start getting Alkalinity then ph, then Chlorine back in check?