Jabao doser air in calcium line


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Hello, I recently added the 4 pump Jabao doser to my tank. Im dosing brs 2 part. Alkalinity is working great but the calcium line gets air bubbles. Every other day a tap out bubbles and manually pump fluid through the lines. Only to get bubbles again the next day. My doser is level with sump so no incline or decline on tubing. Any help or experience with this?