Or anyone else that has experience for that matter. My tub needed a little shock tonight so I dumped in big dose of dichlor. Frequently when I do this I think about the waterfalls. There are two of them, they came with the tub, I wouldn't have special ordered them. I rarely use them, but can't say never. When shocking I wondered if I should occasionally run the waterfalls so that they get cleaned out. For those of you who have looked, does algea, mold, or other nasties grow up inside little used waterfalls on otherwise well maintained tubs? I figured you would be the ones who would know.