Summit...responsible solutions 110-12 Mosquito Dunks, 6-Pack

Nothing harmful, except for to the blood-suckers! Help tremendously! I have a reminder set to add one to the ornamental pond monthly. (Based on size / gallons, as to how much to use.). No harm to the "fancy goldfish" in the pond, no harm to birds, nor dogs who drink from pond. But - yes - prevents mosquito breeding. Our winters aren't cold enough, long enough, to rid us of mosquitoes. Yet other chemicals harm humans and other life. Yes, I'm a hypocrite. Love life, but ... mosquitoes? Grrrr. BTW, if there is anywhere that standing water can't be avoided, you can easily break off bits of these for those areas, too. They last! Work for at least a month, when used as directed. WELL worth this cost! Follow their instructions or ask. here, and someone will reply!

Works great, excellent product for the money. Kill those pests!

We use these each month in all of out water features. We have much less mosquitoes when we use them than when we dont use them. Seem to be working and will continue for the foreseeable future.

I bought these for my waterfall trough. Sometime I dont run the waterfall for a few days. This helps keep mosquitos from breeding in the trough. Easy to use.

Has a midge issue in our turtle tank...these dunks are amazing! Only used 1/4 of a dunk for a 75 gallon tank. Not only did the midge problem disappear but the water in the tank is clear and the turtles are happy and healthy!

These are a must in an area withstanding water. Great value for your money. I personally have not sensed an oder. It is very effective and can help with maintenance with a regular routine.

I am not crazy about these. they tend to clump up and look gross. I will buy the granuals from now on. These just clog up when wet.

These are ideal for our small, in ground, fountain. (2ft x 3 ft x 18” deep) break them into thirds and drop one into the water from time to time, removing worry of mosquito larvae, without concern it could harm wildlife.