TetraPond Anti-Algae Blocks for Fountains, 6-Count

Killed my fish

I've been looking for a quality algae control for awhile. The liquid ones have gone up in price but don't really control the algae that grows in my fountain. This one does the trick and is reasonably priced. We placed this in the fountain and it goes to work. No need to remember to add it quickly. We were gone on vacation and thought for sure we would need to clean the fountain upon our return, but no, the algae block did its job. Would definitely recommend if you have an algae problem.

I use this product in my garden fountains and have found it to be the best product to keep my fountains from getting algae. Very convenient and easy to use. I put this in my fountains every two weeks.

Product works well. I've been using this product for quite a few months. Used to get it in larger size (28 g each). This is only 12 g each. Unfortunately, the larger size in bulk cannot be sent to CA, because of Prop65 (what a joke!). Widh they can sell the larger (28 g) size block in small quantity to get around CA Prop65. All in all, am satisfy with the product performance. Just make sure you are aware that this is only 12 g each, good for treating 30 - 100 gals.

My small waterfall/pond was getting overrun by green algae. A friend recommended this product, so bought it and once in hand, dropped a single small block into the pond near the pump inlet. Within a few days, water was clear again, and within a few weeks, all the stones were clean again. Pretty amazing. The package label is a bit confusing though, because it shows pictures of fish on it, like for use in Koi pond, but fine print says it will kill fish and birds. Not sure about the actual dangers, but the newts we have running about during rain (and getting into the pond) have not diminished in number.