I have a six-foot indoor fountain and after only a week usually produces a very stubborn biofilm, which is not going to get by frequent cleaning in the handle. Now I have given to the washing ball in the water tank. So far, it works extremely well. So far, no biofilm. I'm just curious how long the effect lasts really. I'll report back. So if that really works, then I have a problem that I have been around for over 10 years solved. Now I have the ball for about 2 months in the Well and the effect is unfortunately rapidly after. So it's not right.
