Mytee System Maintainer clears hard water scale and soap scum from your Extractor's system, making your heater more efficient and improving solution flow.
We generally say monthly is a good idea, maybe every two weeks with hard water and every other month if you have treated water. The solution is only meant to be run through one time, do not put used solution back through the machine.
Not a video but we have step by step instructions with pictures here: mytee.freshdesk.com/support/solutions/articles/17000079789-installing-b141b-valve-repair-kit-in-air-lite-upholstery-tool