Hi! It is me again! Came on here in the middle of summer, bought a used pool and started with BBB from the start, and never had to go to shock level. Had a beautiful clean sparkling pool for the remainder of summer. Thanks to those here at TFP!!! So glad I learned about BBB from here. For the 8weeks it was open we KEPT a 3 FC daily level sometimes going to a 5 when sun exposure/heavy bather load days. It was always crytal clear!
Ready to close up the pool now. My question is where should the FC (shock) level be with a CYA of well below 30 (my cheapie test kit only goes down to 30CYA) I put granules (pure CYA) back in end of July to BRING to level of 30CYA. Thought it would be good to test CYA before I close up to see where it is. Hmmmm. the levels are well below 30CYA (can still see the dot in cloudy water-it is cloudy though) We are closing up the pool today. We shocked yesterday to 12 level with Bleach yesterday, pump running since, vacuumed and cleaned side walls a few days in row too. I will add some bleach to get up a bit from the sun strong today. The most would be 14. Closing with FC level of 11-14 and CYA of say 15or20 gonna be ok? WE are in the Midwest, a snowbelt area, like a 100in a season (!)
With such a low level of CYA is that going to mess up balance of what I put in of bleach now???
And another ? Thought we'd skip the Polyquat60, but if someone convinces me otherwise?
PH: Ranging from 7.2-7.8
CYA: well below 30
FC: shocked to 12 yesterday