We have a Natureshead no major problems liveaboard so need to empty once a month, pee bottle every 2-3 days.
Have increase the edge with silicone near the solids trap door due to liquid flow wetting solids.
Great product, if thinking about going cheap there is a bucket system which seperate liquids and solids you buy the seperator and build the rest (look up ecovita privy kit).
Slave to the dollar, working for next sailing adventure
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