Overall Rating: 5/5
Have used these for years...
Perfect product. Use in birdbaths and small pond for years and recommend them to anyone who asks me about them, usually when I'm on a checkout line. Glad to see they come in granular form. I also break them up to put in potting soil for house plants as all the name brand potting soils I, and friends, have purchased over the last few years have gnats in the soil. Works like a charm.