Hi I inherited a pool and adjusted the Alkalinity to 100 pm, pH to 7.6, and hardness to 250ppm. Then I took the CYA reading and found it to be off the chart. I completed the dilution method and estimated the CYA to be 150ppm. I plan to drain and refill my pool slowly over the course of the summer by draining and filling with well water/rain water from my roof. I plan to be diligent and patient until my CYA levels drop to 50 ppm. I realize I need to drain 70% of my pool and drain/refilling will lead to me draining significantly more then 70%.
I know I will need to spend a bit on chems since the FC needs to be kept around 12 ppm at 150 CYA level. I will test repeatedly as the water is exchanged and adjust my FC as the CYA is reduced.
Does this sound reasonable?
Since I just opened the pool I need to shock it at, from what I read, 48 ppm? Do I need to maintain that level as noted in the SLAM procedure? My pool appears to be very clean and algae free, for now...