Better yet, knock out the
screen...they create more problems than they prevent. Then, to prevent future vent blockages, put a hose nozzle against the vent thru-hull and back flush the vent line every time you wash the
boat. Any critters who try to set up house keeping in the vent line will just get a water slide ride into the tank.
Assuming that your sink drain thru-hull is below waterline and is on the same side of the
keel as your
toilet, there's a better way to supply flush water than using the
shower head:
Re-route the
toilet intake hose to tee or wye it into the sink drain line as close to the seacock as possible because the connection must be below waterline to
work.This will allow you to flush normally with sea water, conserving your fresh water. After you’ve closed the sink drain seacock in preparation to close up the
boat (you do close all seacocks before leaving the boat to sit??), fill the sink with clean fresh water and flush the toilet. Because the seacock is closed, the toilet will draw the water out of the sink, rinsing the sea water out of the entire system—intake line,
pump, channel in the rim of the bowl and the discharge line,(Water poured into the bowl only rinses out the toilet discharge line). If your toilet is
electric, be careful not to let it run dry…doing so can burn out the intake impeller. Or you can keep the sink drain seacock closed except when it's needed to drain the sink and flush with fresh water down the sink all the time...your choice.
It may also be necessary to keep the sink plugged except when in use, with a rubber sink
plug or by installing a conveniently located shut-off valve in the drain hose. Otherwise the toilet may pull air through the sink when you try to flush, preventing the
pump from priming.
--Peggie
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