I began SLAMing my pool 4 days ago (84 hours). My CYA is somewhere between 25-40 so I used the SLAM values for Mustard at 30-40 CYA, which is about FC 22 or mustard and 14 for a normal SLAM.
I checked the FC every 3-4 hours and after the first couple of checks where the FC drop was 5-8 the drop settled to 4-6 (even over night). I never let it drop below the 40 CYA normal shock value of 16 FC..trying to hedge my bet on CYA level.
I scrubbed everything, even the inside of my filter housing, and it the nooks and crannies of my ladder. Yesterday I kicked the FC up to the 40 CYA mustard level of 24, still dropped to the 16-18 FC after 3-4 hours, seemed that the 16-18 FC was where the pool wanted to settle, even during the 10 hour overnight period.
After 8 gals of 8.25%, and plateauing FC at 16-18, I decided this morning to remove the ladder to do a better scrub and WOW i found a panel on the bottom rung that is used to add ballast to allow the ladder to sink. When I removed the cover I found pieces of concrete chunks a little larger than golf balls. They were slimy green and began to "bubble" when I put them in a plastic bucket with a 50-50 bleach and water mix.
About 10 minutes after this photo, the water had turned totally green and you could not see the chunks or bottom of the bucket.
Not only were they harboring my alege, I think they were giving me my radical and unpredicted pH swings...
Any suggestions on a good ballasting material that will fit into 4 cavities-- roughly 3x4 in??