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Review title: Works very well
Product review: We have a small fountain, and the pump does not move the water enough to discourage mosquitoes from depositing their larvae. This product shut down the larvae within one day. The only negative is that when the product breaks down, it leaves crystals along the edge of the fountain, and some of them eventually submerge, which creates a build-up of the product in the base of the shallow fountain. But I'd rather have that then a mosquito breeding ground. I haven't noticed birds drinking from the fountain as frequently either. This can be good or bad depending on whether you like birds drinking (and relieving themselves) from/in the fountain.
