Originally Posted by SV DestinyAscen
I think there are two types of smells in a marine head
- dead stale seawater and bad ventilated holding tanks
. The former you can avoid by using the head frequently or fresh water flush.
The latter is due to inadequate ventilation - if the culture is healthy it shouldn't smell unless you're sticking your nose by the ventilation breathers and drawing air like you're smoking a pipe.
Or permeated hoses.
No smells from my heads. They smell as good as any land toilets; maybe better.
That's down to:
1. Good quality impermeable hoses.
2. Well designed tank with very large diameter vents which keep a healthy aerobic culture going (thank you Bill Dixon). Never the slightest whiff from the tank.
3. Sea water flush, constantly used, or laid up with fresh water to prevent "dead critter stench". Obviously fresh water flushing
is even much better from this point of view, but sea water works fine for me.
toilets, not manual. Allows pumping much larger volume through (to prevent excrement from standing in the hoses); also greatly reduces risk of clogs.
Zero unpleasant smells - nada. Wish I could say that about my gray water system.
I've had occasional problems - for example, broken down Sea Era toilet this year. Unpleasant when it happens, but I generally get a few years between incidents. And in any case, far less unpleasant than dealing with the gray water system - ugh. Gag.
I personally have zero interest in a system like composting toilets which require so much fiddling with excrement. Ugh. But different people may have different priorities and sensitivities, of course - to each his own.
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