If you want to save a little money it is simple enough to avoid having to buy an anti-siphon valve and simply drill a tiny hole in the top of the loop. The hole only has to be big enough to allow air in and you can get creative with the tiny fountain coming off the top of the loop when the pump runs.
That's the solution! I will pop a 1/8" hole in the discharge line, run a bit of tubing back to the tank, and that will solve the problem easily. Thanks Art.
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