Jabao doser air in calcium line

[Markbluereef]

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?
Thx

 

[Adamantium]

I was having this problem, too. Same doser. What worked for me was adding check valves. They don’t allow the liquid to flow backwards, allowing in air.

 

[Markbluereef]

I was having this problem, too. Same doser. What worked for me was adding check valves. They don’t allow the liquid to flow backwards, allowing in air.

Any particular check valve you could recommend? Thanks

 

[Adamantium]

Any particular check valve you could recommend? Thanks

Don’t think it really matters. Mine are just some cheapo ones that came with airline tubing from Amazon. Really, any should work.