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GRAVOIS MILLS - A former alarm-system technician invented a "Dock Shock Alert System" which detects volatage in the water and sounds an alarm if the electrical current reaches dangerous levels. His patent is still pending. Kevin Smith invented the system after a friend complained of tingling sensations near his dock.

Smith started working on it in 2008, and has used earlier versions on his own dock. His next door neighbor is also equipped with one of Smith's "Dock Shock Alert System."

He said the tool won't make the water safe, but it does have the ability to warn if there's a problem.

Smith said there are already people ordering his product, which goes for about $500, but that they will have to wait another 5 weeks to get it.