The DNR frequently receives questions about devices that generate water current to blast muck and plants away. Sold under various trade names, the DNR refers to these devices generically as hydraulic jets. Even though you can buy one, they cannot be used in any way that disturbs the bottom of the lake or uproots plants.
A person may legally operate a hydraulic jet if it is placed high enough off the lake bed so that it does not disturb the bottom or destroy rooted aquatic plants. It should be directed upward toward the water’s surface, which can prevent dead vegetation and duckweed from collecting around docks and boat lifts.
Aquatic plants are important to lakes. They help maintain water clarity, prevent erosion, stabilize the bottom and provide habitat for fish and wildlife. Specific regulations govern what situations require permits for aquatic plant removal.
More details: DNR aquatic plant regulations page
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