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I have struggled adjusting my new calcium reactor for over a month. My biggest obstacle is fluctuating effluent flow. The AquaMaxx C-Tech Nano comes with a pinch valve located after the the input pump (Tom's Aqualift) and water filter and before the reactor. The valve is so imprecise that the very slightest turn of the knob causes effluent flow to change a lot. My initial goal is two drops per second (6 ml per minute). I get the flow set and by the next morning, it has dropped by two thirds or more. Later that next day, it drops even more. Next I bought a $25 needle valve from Marine Depot. Same problem. After I dial it in, it drops badly by the next day. Isn't a steady effluent flow essential to the operation of the reactor? Does every one have similar problems? I should not have to purchase a peristaltic pump.