Hi Folks Do us a favour please and recommend a decent chemical we can use in the RV black tank. In the US we used Thetford Supreme Green, but over here we have just used (I think) Aqua Kem Green. The reason Im not sure what the UK one is called is that we poured it out of the bulky container and into an empty US one with measuring spout. The UK one is nowhere near as good as the Supreme Green, so what could others suggest please ? Thanks Paul PS I know many of you prefer not to use anything, but that option doesn't appeal to us .