What is a trouble free float valve?

[Jerry]

Mine works fine but seems quit after a year or so, it's a Nelson.
This morning it was running and the pond did overflow!  No damage or fish loss.

I did some research. it needs to be disassembled and cleaned.  I will try.

[miguynmkoi]

Well that's no fun.  I thought you had the one that would work, especially in this very drying heat.  I've had to fill at least 2 inches of water in both my ponds.