Bio pods

We've just had our first trip in our 'new' camper van, which has a Thetford cassette.  We've got the Blue Diamond stuff, and I see they recommend using pink fluid for the bowl flush. Having seen that it contains formaldehyde, I'd be interested in finding a more environmentally friendly alternative.  Is it really necessary to use both the pink and the blue? Are bio-pods better for the environment?  What are the "green sachets" people refer to? Is it effective just to use plain water from a bottle to rinse the bowl if there is Blue Diamond or bio-pods in the tank?  All advice gratefully received. Should I have started a new topic for all these questions?

We use the bio washing pods in the cassette, and just plain water in the flush tank.  This is due to having had no flush tank in our previous van, it drew the flush water directly from the Aquaroll, so we were not used to using pink.

We did try it, but soon gave it up as it increased the prevalence of the "black bits".  You can add some Zoflora or other nice smelly stuff to the flush tank instead if you wish.

The various sachets are an alternative to the liquid blue or green, easier to use and less weight to carry.  Blue  is the standard, but some sites,  which are on septic tanks, require you to use "green" chemicals, so there are Green sachets too.