Quote Originally Posted by Biffa View Post
Just use different colour tubing?
Just what I was going to say. Off topic, but I used to have to clean my system every 3 months using glycol/dye products. Since I've switched to straight distilled and some PTnuke...I've since been running the same loop for over a year and the water and UV tubing still looks perfectly clear.

You can still run multiple colored tubes if that's what floats your boat...