The Tube Brush kit is a very effective and efficient hydration tube cleaner. My only improvement suggestion would be to make it longer, I've just bought a Source kayak hydration bag with a 1.4m tube and the tube brush kit isn't long enough :-(
Reply by SOURCE Hi Leigh, that is a problem, the new Kayak Durabag has a unique long drinking tube! Please do get in touch with Customer Service with that issue if there's something we can do about it. Happy paddling with SOURCE!