Review title is The old familiar brand. [SEP] If you got a waterbed, you gotta have algaecide. This is the same brand I used starting in 1972 in my first waterbed, the same we sold at the waterbed store where I worked in the 1970s, and so it seems friendly and familiar. My household has two waterbeds currently, so it's nice to buy ten bottles at a time, so we're covered for a few years. I put a bottle in whenever I move and have to refill the beds, and also about once a year. Have never had any algae problems.