Originally Posted by No Ice
Hope you experts can help!
My main concern is how do I flush the pipe work with fresh water
with the boat on the hard
without damaging the toilet pump?
It won't damage that toilet pump, because Groco doesn't make a true electric
toilet...the electric motor
only replaces the pump HANDLE on a Groco Model K (or an EB, which was discontinued several years ago). The pump is still a manual pump...you just get to push a button to flush it instead of pumping it. (Btw...the same is also true of the Raritan
To prepare the toilet properly you need to flush the salt water
out of the entire system--the intake line, the pump and the channel in the rim of the bowl...just pouring water into the bowl can't do that because bowl contents only go out the discharge and down the discharge line, they don recirculate--at least they shouldn't!--through the intake. So you'll need to disconnect the inlet hose from the thru-hull and stick it into a bucket of clean fresh water to which you've added a quart of distilled white vinegar. Flush the whole bucket through the system, then another bucketful of just clean fresh water. Make sure to flush long enough to get all the water out.
If the boat is in a climate where there's NO freeze danger
, that's all you need to do...to the toilet anyway...you didn't ask what to do to prepare the holding tank
, which also need more prep than just pumping it out.
If freeze is likely, or even possible, the final step--AFTER you've prepped the tank too-- is to flush non-toxic potable antifreeze
("pink stuff") through the system...stick the inlet hose into a gallon of it and flush it all through the system. Don't reconnect the inlet hose to the thru-hull...leave it off and the thruhull open till spring.