We have a outdoor salt water tank that burns though heaters.I am usually the first person to get shocked when one goes bad.
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check out the corrosion.I thought this heater was the only problem.Then I got shocked again a few days later.
So I installed this product as directed and when the power was restored the GFCI tripped.So by process of elimanation(unplugging fixtures,resetting the GFCI),the faulty device/s have been found.I can now examine the power head and hang on the tank filter for damage.So far I think this device has paid for itself.It saved a lot of time,trouble and possibly livestock.I hopefully will not be shocked again.Time will tell.
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This product is available at Animal House Exotic Pets,Corvallis.