This is an interesting product. The title is misleading though. It does not inhibit algae growth, but inhibits the algae from clinging to the tank glass. Algae can simply be rubbed off with your fingers. In the reviewer's experiement that even a simple water change caused some algae to detach.
Essentially, the product utilises nano-technology. A film is sprayed on to the tank walls before the tank is filled. Given that, it can only be used before setting up a tank.
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