Lots of discussion on this if you search, but in summary;
Putting cassette contents into a WC is OK - BUT if you use Formaldehyde based blue chemicals it can damage Sewage treatment plants & it is not good for septic tanks as it kills the bacteria that break down the sewage. Most on here either use no additives or Bio washing powder/ liquid or tablets which are less damaging to the environment.
I thought I had a good understanding of this subject, UNTIL I read all of the many threads on here in recent weeks! It could be an overload of info and opinions that's causing my temporary confusion, but
could we please confirm the basic facts again?
I understand that biological washing powder (incl liquid and tablet form) will do a SIMILAR job as the blue toilet chemical; ie treat the waste and help to mask any odours. But because it works BIOLOGICALLY, it will also kill the bacteria that would otherwise break down the solid waste, thus making it UNSUITABLE for emptying in most out-of-the-way public toilets (in the wilds) that are likely to work on the septic tank principle?
So, are we saying that:
1. BLUE chemical should only be emptied on campsites, which have a separate holding tank to store it until it is removed by tanker to a specialised treatment plant?
2. BIO washing powder MAY be emptied on campsites (as 1.above) and also into any WC (or manhole) that is connected to the mains sewage system, but NOT into any septic tank system?
3. GREEN chemical can be safely emptied into any mains sewer, campsite holding tank, PLUS any septic tank system?
4. UNTREATED waste can be safely emptied into ANY system (similar to the GREEN chemical above)?
5. How about NON-BIO wash powder? Would it be effective at all? Could it be safely emptied as per 3. and 4. above?
(6. If you choose to ask the landowner for permission to bury your waste, HOW exactly would you phrase the question?

).
PS. Although I included the quote from Smaug, the query is open to anyone with suitable knowledge and experience!