Because sea water had a pH of 8+, sea water flush toilets are more prone to struvite formation (and other precipitates)...
Most "other precipitates" such as sea water calcium carbonate and salt are pretty much limited to systems that use sea water, but the high incidence of struvites in RV tanks and sanitation plumbing contradicts the idea struvites are more common in sea water toilets than in fresh. The pH level in the tank may play a part, but failure to use enough flush water plays a bigger one. A weekly dose of 1-2 cups of distilled white vinegar flushed all the way through to the tank, followed after 45-60 minutes by a quart of clean fresh water will prevent most buildup. White vinegar CAN also dissolve a buildup, but the vinegar would have to be replaced every hour for it to work, making it way too labor intensive.
SanX (nee TDX) or any other toxic chemical in the tank would make it impossible to use aerobic bio-active tank management to prevent odor 'cuz killing bacteria doesn't work.
--Peggie
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein
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