I just took over doing the chemicals of my pool and I have business trips and vacations coming up. How do I prepare the pool ahead of time? In general, I understand the theory is to replinish the FC lost per day. The problem I have is translating that number to how much chemicals to use before I leave.
I have seen suggestions to bring the pool to shock level prior to leaving. But how do I estimate how long that is good for? My understanding is that it's a percentage loss. So let's say normally I have my FC at 4 and next day at 3, which equals roughly 20% a day. So if I start at 12, I would go down to 9.6, 7.7, 6.2, 5, 4, etc? So the shock level should last me 5 days?
Then let's say the shock level chlorine is insufficient to last the entire trip. I have seen suggestions to add trichlor. That's okay as my CYA is low enough (30 now) to take it. But how do I know how many tabs to put in, given that I will already bring the pool to shock level prior to leaving?