Hi
Odex Racasan was a UK company, long since defunct, that produced the chemicals for addition to camping toilets. They must have had some relation to whoever had the Porta Potti franchise here in the UK, or perhaps held it themselves, as their sachets were always included in the Porta Potti range. The one in the picture is a Cruiser 430, a most apt model name and dates from some time in the late 1970s or early 1980s. The Porta Potti range is produced by Thetford now, but I don't recall if that was the original manufacturer's name. If you are interested, I do still have the original box, but need to get into the garage loft to look at it.
Racasan were based in Cheshire, not a million miles from where I am based and produced an early camping toilet which is, apparently now a design classic (
http://www.modip.ac.uk/artefact/aibdc-003424). It is, however, basically a bucket with a seat. Thetford's 1968 introduction of the two part cassette based Porta Potti was a great lap forward as it provided flushing and a sealed waste container.
Regards
Pete