Negative Positive
Title: Blue water
Review: It works great for me, very nice light or dark blue. I can't report on prevention of algae because I didn't know it was supposed to do that (guess I should have read the label).. Judging by the amount of algae I did get, I suspect it may not work that well, but I'll keep an eye on it. If it's outstanding, I'll update.
Is the review positive or negative? 