Re: potable water systems
I think it's worth having if only to wash your hands etc. Also once you start letting systems fail it's a slippery slope. Just try to keep things working and you'll be better off.
My tank had also been unused for about 9 years. It had some mold but when I went to replace the hoses I busted the fittings. So I cut the tank out and put in a flexible bladder. I never drink it so I can't tell you what it tastes like but I'm glad it's there.