The motor of the Automatic Dosing System primes itself for about 10 seconds when first turned on. After that, press and hold the 2x button to get the liquid moving through the tubing. The first part of the tubing leading into the check valve is clear so you can see the liquid progressing. Once you see the liquid dripping out of the end of the tubing, let go pressing the 2x button. That's it!
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