Bunny, maybe you have a pinhole somewhere in your tubes that is causing bubbles to enter slowly.
I am wondering if it is possible to eliminate this and evaporation by having a closed air trap. Let's say your reservoir where the highest point in the system... and say you leave an inch of space left above the water... would not the bubbles become trapped there, and since it is the highest point in the system, the bubbles would not reenter the water flow?
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