I love it. Purely mechanical and no stinkin' electronics - just plain 'ok juice from the wall. I suspect you start by priming both legs of the tube. If you do that, you shouldn't have to concern yourself with dilutions and it should be very reliable. Kudo to the Dutch and acting on it.
Andrew, MASI Treasurer
This message is always under construction: 75-gallon tank; 2, Eheim 2026 filters - one twice broken; Tek Light with 4, 54W T5s (6000K) ; Sand on top of 4:1 sand:clay mixture; Milwaukee CO2 controller; PlantGuild vortex CO2 reactor; pH = 6.6, kH=70mg/l, GH=120mg/l; EI; Flourish excel on 50% weekly water change: AGA Member.