Wow, those are some long runs. Do the vertex diffusers use a mechanical check valve, or do they rely on the elasticity of the membrane to settle closed and prevent water entry when they are in a relaxed, (no pressure), state?
I'm just envisioning pressure building in the lines and the diffusers until it overcomes the membrane's resistance, then exhausting, (bubbling), at a quicker rate than the compressor can replenish it. Then it builds up again and the cycle repeats itself.
