Kalkwasser stirrer
 

I purchased an aquamedics stirrer / all seams well except for the fact that once the ro top off goes through the saturated water in the aquamedics stirrer and is finnished topping off my sump, the ato stops the water then the saturated water in the stirrer back syponsons about 1/4 of the kalkwasser solution from the stirrer container into my ro water container..... any ideas what I need to do to stop this from happening as I see some the kalkwasser settling on the botom of my ro water container.

Thanks for any advice

I had the same problem, I put a one way check valve on the fresh water supply line. Problem fixed.

i have been running my Kalk Stirrer the Barr Aquatics K3020 from the RO/DI and all you do is run the line and before going in add a small Gate Valve to the input so you only let in what you are turning.
ie if you want 1 drip per sec going in then 1 drip per sec is going to come out. its fool proof I have been running this setup for atleast 10 years