Check your lines carefully. You may need to try different types of tubing. I know there's a lot popular cool looking stuff out there but if it let's air in it's useless. I tried to use RO tubing and it let air into the system. I switched to plain old clear vinyl tubing and have had zero issues.
I do have some silicon tubing I haven't tried yet but if it's not broke I'm not messing with it. Other than that, do as the previous poster suggested and purge all the air out of the lines into a separate container then empty the product back into your dosing container once the lines are clear.
