For 2005, Raritan has re-done the Purasan system to make it able to be used with nearly all marine toilets. There are three basic requirements: 1) the head to which it will be connected must have a positive pump on the discharge side. It cannot be used with porta-potties, marine traveler toilets, recirculating toilets, jet flush or Galley Maid toilets. 2) the boat must have a pressure water system installed on it. 3) The dispenser canister must be able to be mounted a minimum of 15" above the actual treatment box. This isn't usually a problem on houseboats that have _base_ments, but it can be tenuous on cruising boats.
It can even be used together with many manual toilets, as long as the head has a piston or diaphragm pump.
http://www.raritaneng.com/pdf_files/purasan/L405v0804.pdf Vic Willman38399.2117013889