OK. That's pretty much what I've begun doing. If the FC gets below the top level of the OTO test I use poolcalculator to figure out how much to take it back up to shock with the BGC. I have a giant bucket of 73% cal-hypo that I've been using to keep the level up that I bought before I became disgusted with the pool store. It was a long time coming, and she looked me straight in the face and told me that sodium bicarbonate and sodium hydrogen carbonate were not the same thing. She also told me that I couldn't test things myself. I had to use her machine. Our relationship was over even before I found your site.

I agree on the sand filter. I knew I was in trouble when I saw that the pump was rated at 70gpm, and the max rating for my filter was around 55. It says it right on the side in big numbers. Who comes up with this crap? Could this be the reason that although my water is green, it's not swampy and I can see all the way through it? My algae is just really fine?