Ever heard of the elephant in the room? Presume you missed the word Legally somewhere in that question?
Each council has its own rules, so you need to consider local bylaws as well as national regulations. Despite it being common practice and even recommended by some suppliers, you will likely find disposing in rubbish is not legal in many areas. (Arguments such as "No different to nappies" may be logical and common sense, but that is an argument why the law is an ass, not an argument that makes it legal if it is not)
Worth a read... https://nzmotorhome.co.nz/forum/viewtop ... ts&start=8