Automatic Doser (Check Valve????)

[masonicman]

Question? I made an automatic dosing system with vacuum pumps. Do I need to use check valve on the system? If so? Where do I put them? Close to the tank? Near the pumps or after the chemical comes out of the bottles?

 

[masonicman]

BUMP

 

[davjbeas]

The check valves you will find for sale in this hobby are for air. But you could try them.
What are you dosing?
I would put the check valve after the pump.

David