The brand is "Fountec." It's not safe for mammals or fish, but specifies on the label that it's safe for birds. I have 2 birdbaths, one of which is a huge old cement thing that is impossible for me to keep algae free without the use of something like this. (The other bath is much smaller and lighter weight, and I just scrub it out and refill it every day.) I don't have any mammals that drink from the big birdbath in my back yard, and the birds haven't shown any ill effects from the algaecide. They come in flocks to bathe, 6 to 8 birds in the bath all at the same time! The larger birds -- crows, jays, starlings, evening grosbeaks, robins, etc. -- use the bath in the back yard, while the smaller species, such as finches, use the smaller bath in the front yard. (I've even seen a seagull in the big birdbath a few times!)
My handyman is going to install a solar powered submersible pump in the cement bath soon, which will turn it into a fountain. He's also going to set up a mister in one of my trees in my front yard. It all should be quite lovely!