I'm a new pool owner (vinyl liner, 25K gallons) with almost no experience maintaining water quality. Pool school was very helpfull but when talking to local (Jacksonville FLorida) professionals there seems to be a lot of difference of opinion concerning CYA levels.
3 Locals state that at a recent pool conference, higher CYA levels (around 100-120) are completely acceptable and are no cause for concern.
How will this affect the FC guidelines stated on the FC/CYA table if at all?
Initial readings on my pool were as follows:
FC - 5
CYA - 120
Total Alkalinity - 100
pH - 7.6
Total hardness - 100
These are all in the acceptable ranges, however the pool water has significant algae growth. I'm assuming that the high CYA level is limiting the effectiveness of the FC.
On the advice of the locals, I shocked the pool with 12% NA Hypochlorite purchased from them. 3 days later the pool finally cleared up, was brushed and vacuumed.
Now the FC levels are >10 and I was told that we should NOT swim in the pool with FC values >10.
I'm confused by this after looking at the FC/CYA guidelines on this site where at a CYA level of 100, the "Target" FC level is 12.
Are there posted levels available at which you should NOT use your pool? If so, where are they?