Just use the powder down the vac line while your working, No reason to stop..
I love watching new folks coming into the industry, its better than cable, It was a nice video overall and its cool he has his son working with him..
If he's lurking and reading this, You really should work your way into the room and not start at the back, Pull the hose with you instead of going backwards, Its a lot easier that way,
Wanding just the opposite
One of the reasons I use the powder is you can clean the hose out as well, But it was fun to watch, Best of luck to them both...
The JAGUAR MX-2 ETM @ cross-american.com