GMM wrote:
On 16 July, 09:23, "Mat C" wrote:

I'd second Owen's Milton suggestion - It's the recommended way of
cleaning things like camelbak water bladders. Of course, if it's
scale-type stuff, you might be better off with something acid like
vinegar - maybe each of them in turn would do a job. Whatever you
use, if you fill the reservoir, then run enough through, won't it fill
the tubes/loops so it can be left there for a bit to do its job?

I think it's a plumbed in fridge. No reservoir.

Tim