A friend sent me the link to Aquatic Biologists, Inc's website where they list the products for algae and weed control.

Tired of nuisance aquatic weeds on your waterfront property?
Eliminate them with a Beachcomber lake Rake

The lake rake removes weeds at their source - the roots! Unlike weed cutters and chemicals that only destroy the top part of the weed, the lake rake pulls out the entire plant preventing future growth. Also, effective at removing muck, dead leaves, sticks and other debris. This product is durable, lightweight and easy to assemble.
Safer, more effctive and economical than chemicals or weed cutters - removes the entire plant! Also effective on many types of algae.

Ideally Suited for:
• Beaches
• Docks
• Swimming Areas
• Ponds
• Resorts

From what I can see, there is one major problem with it.

You are required to clean up your own area.