I was at Target before I got the Bambi and got on closeout some Coleman tank packets. I think there are about 12 per box and the box cost about $3.
It is suppose to break down stuff and it also keeps it less offensive. I have also used the stuff that came with the trailer, it's the Thetford liquid stuff. Really they both seem to work well, just that I lucked out at Target one day. I think I have a 2 year supply! So pretty much cost and how effective it can be is what drives my selection of it.