Hi All, I want to upgrade my DI vessel to a larger on as I have to constantly change the resin in my SMALL one 1Ltr cartridge. I was thinking of purchasing the Gardiner 7Ltr one?? http://gardinerpolesystems.co.uk/al...itre-resin-bead-pressure-vessel-canister.html Is it as simple as I think? remove old 1Ltr housing - secure new 7Ltr vessel - connect existing hose and *Boom* all done? Also please can somebody confirm what size the hose I have is coming from the existing 1Ltr housing is? 3/8"????