We had an SWG installed on our pool last weekend. We had originally wanted to get a Pool Pilot, but we have a very good relationship with our PB, got a good deal on the installation plus we get a 3 year warranty through the PB as well; so we went with a Pentair IC-40. BUT... it seems to me we have to run it a lot harder than I was expecting. The PB seems to think it is operating normally, but I wanted to check and see how everyone else's run time compares to ours. We have a 13k gallon in-ground pool that was completed in March. We used an inline chlorinator, then switched to BBB and we have never had a problem with the water (other than climbing CYA which is what led us to the SWG). CYA level is 70. We use a TF100 test kit and all other numbers are within normal ranges (except FC, running at 1 right now). Pump is a Pentair 4x160 running at 2200 rpm on circulation mode. We were running the circulation for 8 hours during the day and the installer set the SWG to 40%, but upon checking the FC the next morning it was 0. We bumped the SWG to 80% and FC has been testing as 1.0 since then, still too low. I called the PB and they suggested increasing run time to 10 to 12 hours, increasing the CYA to 80-100 and running at night instead of during the day so that the sun wouldn't burn the FC off as soon as it's made. I increased the run time to 11 nighttime hours yesterday afternoon, but have not tested it yet since then (will do so this evening). Our pool is in direct sunlight all day and it has been in the mid to upper 90's here lately (water temp 88) and probably will stay that way until September. Now it seems to me that the IC-40 which is supposed to be good for up to 40k gallons is way bigger than our 13k pool needs, so I was expecting it to handle the load easily running at a much lower percentage. I mentioned this to the PB and he said the IC-40 is designed to handle 40k gallons if run for 24 hours a day at 100% and that it is not unusual for it to have to run at 70 or 80% for 12 hours for a pool of my size. As always I appreciate comments, feedback and comparison info Thanks!
Oops, forgot to mention that the salt level is 3700. They were targeting 3350, but got a little too much in because their records indicated our pool was 16k instead of 13k.