My Med II tubes......
......certainly do not look as good compared to the tubes on my previous Med I which, was two years older. In fact, I saw the old girl recently and her tubes, looked better than mine.
I use REVIVAL by Zodiac, it seems to do the job but since they changed it from a liquid to a compound, it's just not as good.
By the way, if you ever wish to sell your Med II, let me know, I have a buyer lined up already. He is desparate for mine but I ain't sellin'.
Buy it & Use it, then sell it and buy something bigger