One more thing the down pipes should reach just and inch or three above the bottom of the tank. The one real risk is if either tank gets low enough, the siphon breaks.

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Agreed, I’ve used this for 2 years, i just recently had one pipe fail because the joint must have cracked allowing air in.

Monthly, I will flush with a hose, just to get any air out. If next to an stone or bubbles in the water, put an elbow to prevent bubbles from rising into the pipe.

Thanks!