osmolator pump alternatives?

[Willito]

Originally Posted by fishface

i'm doing about 6 horizontal and 4 vertical feet. i've been dealing with bubbles in the line for quite some time, do alot of knockin' em out. problem with the check valve is that i'm pretty sure it wouldn't be able to push through it! also, reservoir never runs dry...i like Sean's idea with the relay and may give it a go.

When air pockets are present in the line, it usually transfers to the pump, this is where your problem lies. In the past I've used 2 check valves on the same line and the pump was still managing. This was because I was dosing Kalk via top-off and the dual check valve prevented any kalk water from back flowing into the reservoir. I stopped using kalk so now it's just the one cheap check valve ($1.99) and it does the job. The other check valve was the John Guess fitting one, ($10).