water stations

Hi all, I am working on setting up my RO/DI unit in my laundry room at my apartment. I've been looking around for a non-copper Y valve for my washing machine cold water valve. I've found them for garden hoses but am not sure if those will work. Any ideas/suggestions?

I have been having major problems with my tank for a while and basically, it is slowly crashing, though all parameters are stable and within normal limits and Triton test shows the same. Trying to figure out whats going on and one thing that's come to mind is that it has possibly been since I...