I have been searching for one of these, I want to use it in my spa and even in the pool from time to time. I just closed down the spa for the summer and had a very good year of using BBB. As already known when using chlorine, I had to watch and add a small amount every other day or after use. Never had an issue this season. If I can’t find something, I am thinking of making something for next year.

Anyone have a lead on one of these?