Interesting.. never heard of the stuff until now. However, after searching their site, I remain skeptical because there's no explanation of how it works nor is there a list of ingredients. Is it snake oil or an algaecide? Either way, the best way to control algae is to address the root cause, whether it be too much light or not enough co2 - or all of the above. Plus it'll save you of having to buy into that system, which you're right, is rather expensive.