I'll "second" Bill Cody's comments. This market is an easy entry for many manufacturer-wanna-be types since an EPA registration isn't required and performance-complaints are difficult to press.
However, based on the sustained use of Keeton's products by our commercial lake management customers, I suspect these specific products are working for the desired purpose - otherwise, they wouldn't continue to be utilized.
Keeton has two primary microbe blends: AQUATRON and WASTE & SLUDGE REDUCER. AQUATRON is a blend of aerobic microbes, which target suspended nitrogen and phosphorus in the water column. W&S REDUCER is a blend of anaerobic microbes that focus on digesting bottom-dwelling organic materials.
Neither product makes any overt algaecide claims - since doing so would prompt the need for an EPA pesticide registration.
One comment to contemplate: Planktonic algae, which form the base of a healthy food chain, require nutrients too. Be certain of your objectives and possible repercussions before initiating a nutrient-management program.