I just filled up my spa about two months ago. It has seen very little use since then (maybe three times) due to me being on vacation for much of that time. When I came back from vacation a couple weeks ago, I tested the water and the bromine was at 20 ppm. I immediately removed the bromine dispenser to try to lower the bromine level. Just last week, I tested it again, and it was still 20 ppm. I decided to try removing the lid thinking that it would help off-gas more of the bromine, and the UV rays might help lower it as well. Just checked it today, and it's still 20 ppm. This baffles me. Usually after shocking it, it goes back down to a normal level after just a day or so. I can't think of why these crazy high levels would be occurring. I've never seen anything like this in the eight years I've had this spa. I could just bite the bullet and drain the tub, but I really don't want to if I can avoid it. Does anyone have any ideas why this is happening? Thanks for any help.