I didn't think they even have a filter, but I am not an expert. In fact, if I get to be an expert in macerators and Lectra Sans its time to move on to another hobby.
My understanding is that there is a macerator on one side and then it goes it to the other side where there are elcetrodes and the blade mixes to ensure everything gets treated. The electrode plates creates bactericide assuming there is power to the unit.
Here is what Raritan says about odor problems...
• Odor permeating through hose or connections. Rub damp rag on hose, if odor transfers to rag hose needs to be replaced with high quality sanitation
hose Raritan part # SH
• Treatment unit is leaking. Follow discharge hose from toilet to tank, lift blue
cover and check area around motors too
• Electrode not functioning properly. Follow above for Amber and Red light conditions
• LST/MC not being activated with each flush System must be activated with each flush
• Treatment unit not being stored properly