Thanks, but that's not quite what I said
There are many "job specific" household products that should NOT be used for the same job (or any other) on a boat...household toilet bowl cleaners being one of 'em. There are also plenty of products made to do a particular job on land that work well for other jobs on a boat...for instance, white wall tire cleaner does a bang up of cleaning fenders and rub rails...and somebody had to be the first to try it. So there's nothing wrong with experimenting, as long as you know what's in it and how it can interact with any other products or materials in a system.Denture cleaners may do a dandy job of keeping a porcelain bowl clean and free of hard water stains...but I don't know yet whether the active ingredient(s) in 'em can damage hoses or the rubber parts in a toilet pump, or the electrode pack in a Lectra/San...or what kind of chemical reaction can happen between whatever is in denture cleanser and certain holding tank chemicals. John Nantz, you said you've been using it keep the hard water stains out of the bowl for some time...leaving it to stand in the bowl for days or weeks. If denture cleansers are harmful to rubber, the first thing to go would be the joker valve in the toilet discharge...have you checked it or replaced it since you started using denture cleanser? If so, and you haven't seen any sign of damage--swelling, distortion, cracks, etc--I'd say it's safe to use in a toilet that goes into a holding tank. However, Raritan warns against putting ANY chemicals--especially bleach and household bowl cleaners--into a Lectra/San, for two reasons: 1) they can damage the electrodes...2) they can combine negatively with the hypochlorous acid produced by the electrodes to produce a toxic gas...or both. I just talked to Raritan, and this is the first they've heard of using denture cleanser in marine toilet. Till they know what the impact in a Lectra/San is, they advise against using it if you have one.