Looking for an inexpensive alternative for the "SÖLL" String Algae that I use for some time, came across this product due to the still positive reviews. After 4 weeks, I can say the algae grow uninhibited and cures my pond plants. I want to add that I've followed the instructions provided. At this point I would like the positive reviews that have been created without a corresponding purchase designate as untrustworthy. I will once again use the reliable, albeit expensive Algervernichter 1/3 of Söll.
My conclusion to Osaga Thread Algae Destroyer: Absolutely useless !!