Bingo.
I did a bunch of testing with chemicals vs. head pumps and hoses, and nothing was as generally destructive as urine that sits. I included some pretty aggressive chemicals that should never be used in a head. Ammonia, uric acid, and hydrogen sulfide are tough.
Yes, with more water the tank fills faster, but it also pumps out faster and accumulates fewer solids. Actually, the only tanks with significant solids where those where vegy oil had been used as a lube. Just saying.
Interesting observation about the destructiveness of ammonia, uric acid and H2S. To prevent the destructive effects of urine on head hoses and tank, I have routinely peed into my head sink for the past 13 years, instead of the commode ( so does my athletic admiral
) .
Before anyone goes uhhhh,
consider....
a boat sink is simply a funnel connected to a hose that goes directly overboard ...
peeing overboard is legal, although discharging a holding tank with urine in it is illegal...
urine is sterile (unless you have a UTI), so discharging urine into your sink is no more "unsanitary" than putting cleaners, sour milk, or any other liquid into it.
we rinse the sink with a cup (or so) of water, after use, just as you do when you put anything else down it, and have never had a hose odor problem ( from sink or head ). ...
And one last thing ... no one has ever fallen overboard as a result of peeing (overboard) into their sink; so, it's a safety thing, too... :dance: