I just installed a Pentair IC40 SWG yesterday. Before the upgrade all readings were within recommended range with FC coming back from a superchlorination and at around 5. I checked the pool last night and FC was at 10 after only 8-hours of runtime with IC40 at 50%. I dropped the IC40 down to 20% today, and FC is still 10-11 (no CC).
PH - 7.5
Salt - 3400
CH 0 300
TA - 80
CYA - 70-80 (still getting used to this test)
I turned off the SWG and am going to wait for FC to go back to 5 or below and then start running it again. The SWG shows low flow at 1210RPM so I set low speed at 1800 RPM for 4-hours a day and high speed at 2300 RPM for 4-hours per day (2-4-2) with high speed during middle of the day when sun is directly on pool. I plan to run it longer on weekends when it gets more use.
Any suggestions or is it just trial an error to figure out the best pump run time, RPM, and % on the SWG. I know it is oversized, and from what i read on this forum, it is worth the minimal cost difference as it will last longer. I have a seasonal pool, so I am hoping to get 5+ years out of it.