I've gone and done the unthinkable; did a complete drain and refill of my AG pool in a drought area. I've had it fighting a constantly green pool. Especially when I don't fully understand why algae loves my pool so much. Here are my chemistry results while I had a green pool and before I lost my patience and drained it.
CH: 62 (sort of irrelevant since I have an AG pool)
Even with the above results, the algae was having a party in there; alive and well and a beautiful shade of green. I know a large part of the problem is my high CYA level. It's an unavoidable consequence of using di-chlor tablets over time. Two weeks ago I had my house painted and forgot about my pool for 4-5 days and naturally it was a swamp. So I shocked it with 4 bags of lithium hypochlorite and the next day the green was gone and after another week of filtering I had just about cleared the cloudiness, when one day I notice dirt on the bottom with green under it. I checked the FC level and it was 14.5 and ran my pool cleaner to clean out the dirt and left for the day. When I returned, the pool was a cloudy, green mess. So I shocked it again with 5 bags of lithium to a FC of 48 and filtered all night. The next morning the pool looked exactly the same as it did the day before. That's when I lost my patience and just drained it and refilled it. According to the pool math tool, at a CYA level of 180 my FC level needs to be 14-21 with a shock level of 71. I would need at least 12 bags of lithium shock to achieve that FC level. I can't afford to be putting $100 a week worth of chlorine in there just to keep the green out. So my question is: did I do the right thing by draining and refilling to get rid of the excess CYA and then throwing away the di-chlor tablets and switching to liquid sodium hypochlorite?