I'm having an algae problem...again. I had a problem about a month ago with fine green algae covering only the floor of the pool. I shocked for a few days until I passed the OCLT, and had less than 0.5 CC. I wasn't sure if it was mustard algae, so after shocking was complete I brought the pool up to mustard algae shock level for my CYA. I also put everything that touches the pool (toys, ladder, etc) into the water while it was at mustard algae shock level. After that the pool looked fantastic until today when I returned home from a work 3.5 day trip. Before I left on the trip I brought the FC level up to 12.5 and covered it with a blue solar cover. While I was gone we did get some severe storms and the air temperature got to around 96 (very warm for this time of year). When I took the solar cover off today the bottom was covered with the fine green algae again! I brushed the entire bottom of the pool and have started the shocking process. When I brushed the bottom the water turned a slight green for a bit, now it just looks very dull. I have been religious about keeping the FC at or slightly above the normal range since last month. I'm at a loss of what to do other than shock and go back to mustard algae shock level. I'm confused on how the pool can turn green with algae when I've kept the FC level within the normal range for my CYA level. What's even more frustrating is I have 2 separate neighbors that have pools, and their pools have been blue all year long using nothing but pucks in a floater :grrrr: Here's my test results from today (before I shocked)
FC-8
CC-0
TC-8
PH-7.5
TA-110
CH-170
CYA-50
Temp-78
FC-8
CC-0
TC-8
PH-7.5
TA-110
CH-170
CYA-50
Temp-78