Kalc reactor is backsiphoning?

[Crustman]

Got a GSA kalc stirrer. Hooked the tubing from my reservoir pump to the intake of my stirrer. My ATO activates to fill up the stirrer and dump fresh kalc into my sump but when the AZOO pump stops, the kalc is backsiphoned into the reservoir. How do I stop this? Can I buy 1 way check valves for the tubing? I may have to buy an aqualifter pump. Thanks

 

[Avast Marine]

http://www.airwaterice.com/product/WB-CV3344-Q/Check_valveUnion_In_Line_14.html

 

[Crustman]

Thanks Dan, you build a great product. The stirring arm is stiring away and I have the outlet just above the sump. Added 1/2 cup of Kalc for 2 weeks as instructed.