CJN

I was having the same problem with my spa. After trying many of the previous ideas and getting nowhere I finally discovered my problem. The spa frog aways ends up in a relative dead spot on the surface of the water. I tied my spa frog close to the pump outlet so it was in a constant stream bobbing up and down. Now I get enough bromine on the lowest setting where before I wasn't getting enough bromine even on the highest setting.