Thanks for that Cwrw666, that's really reasurred me. My coopers FV which I use as a no chill cube is similiarly browny green stained on the inside. It's about 3 years old and I was wondering just how much longer it can keep going - seems I can get at least another 7 years or so out of it.
You've saved me some cash too as one of the main reasons I wanted the SS brewmaster bucket was to use as my no chill cube (and retire the coopers FV). :hat:
In the past I've found that eventually plastic FVs will crack across the bottom, but maybe this one is made of better quality plastic. Pitting in stainless steel might be more of a problem depending on the nature of your water. We have very very acid water as it comes straight out of a peat bog.:lol: