Review on Efficient and Versatile: Jebao DP-3 Programmable Auto Dosing Pump with 3 Channels in Sleek Black by Blair Foster

I read the reviews before buying so I already knew that frequency 0 means every day. but this thing won't stay refilled for more than 24 hours. If you have thousands of dollars worth of coral, don't trust this inexpensive donor. I've tried everything I can think of (silicone tubing, zip ties on connectors, swapping pump heads) but nothing has prevented the lines from refilling with air. which caused my alkalinity to always drop (because no solution was actually provided). I've just ordered a higher quality dispenser from an online aquarium store so I hope this solves the problem.