If the treatment unit has Lectra/San on the side of it, what you have IS a Lectra/San....or was. I strongly suspect someone has tried to turn it into a PuraSan by adding the chemical cartridge to it. That may be because they destroyed the electrode pack in it by using household chemical cleaning products to clean the toilet, or because the Lectra/San needs salt, and the PuraSan chemical cartridges cost less than either a new electrode pack or a salt tank. Unfortunately, that won't work. Nor is it any longer a legal treatment device.
You need to see how both systems SHOULD be installed and how both are SUPPOSED to work. So the first thing I want you to do is spend some time reading both the Lectra/San and the PuraSan manuals on the Raritan website...start on the "waste treatment" page at
http://www.raritaneng.com/products/waste_t...ment/index.html and go to the manuals for both from there....they include diagrams of the way the systems should be installed, and all the components that belong in each system...neither system should be missing any or have any extra ones.
Then I want you to call Vic Willman at Raritan--800-352-5630 x 2 to discuss what, if anything, can be done to salvage your system short of replacing it altogether.
Your odor in the toilets is most likely a separate issue. My guess is, the toilets are in serious need of rebuilding, and the treatment device may be too far away from the toilet....waste is being left in the toilet discharge hose. What make/model are the toilets? And how far from each toilet is the treatment unit?
Don't use detergent to clean 'em....nor should ANY chemical household bowl cleaners or any other household cleaning products EVER be used in ANY marine toilet....they're highly destructive to the rubber parts in toilets and to sanitation hoses. The only bowl cleaner I recommend is Raritan C.P. --a bio-enzymatic bowl cleaner that won't harm the rubber parts in a toilet or anything in any treatment device. If you don't have it, clean the toilet by hand with little Comet, Ajax, Softscrub, etc on a sponge and wipe off the excess.