I have a campervan and the water is supplied by two 10l plastic water jerry cans. I havent used the van for quite a while due to lockdown but when I went to get the jerry can to fill it there was a small amount in the can but it wasnt very nice looking. Also the pipe had black residue on it. What I would like to know is what is the best way to store the jerry cans and what do you do with the pipe? Also when we were away a chap in a Motorhome we got talking to said you have to change the gas pipe every 5 years? is this true? and why?