Shark Shield is designed for use in seawater which has a salinity level of 35ppt, and will produce a limited field in estuarine waters due to the decreased salinity of the water. Please keep in mind the closer you are to a freshwater source, the less saline the water will be and the more limited the field size will become.


We know people have used Shark Shield in the range of around 22ppt, and suggest that by the time you got down to 10ppt if would be fairly poor performance, certainly the electrical field would be a lot smaller.

The Shark Shield cannot be used in fresh water as it will not establish a protective field in freshwater due to the water’s reduced ability to conduct electrical energy.