Thanks for the note...a geyser effect takes place while draining the bowl after the flush process...the water is clean and is coming out of the main drain hole at the bottom of the bowl. It appears the flap is not closing entirely or the water is coming through the hole in the flap where there is a washer and rivet....I called Groco at the suggestion of someone here on the forum, and described my issues to the customer service
tech, Brian. We put together a solution based around replacing the rubber flap at the bottom of the bowl, and a few other parts
all related to the rubber flap.
Apparently the geyser is being caused by either a hole in the flap (where rivet is placed, or a misalignment. I will take the bowl off and replace with new parts
as needed. I bought a bunch of spares. The Groco Model K is a great item, and I will have to learn how to best care for it. The unit was not used for ten years while the boat was stored inside for all that time. I suspect the winter antifreeze
that was in the bowl did it job to deteriorate the rubber items....so they will have to be replace.
I have read your articles and found them very informative, and will care for the unit based upon your general suggestions, and maintenance
Originally Posted by peghall
I need a little more info... When you say "shoots up out of the bowl," do you mean that the toilet is spitting up bowl contents? Or that the toilet has somehow magically managed to turn itself into a fountain that's spitting flush water out of the hole in the bottom of the bowl? Or out some other orifice in the bowl...like maybe from a hole in the rim?
Or...it's not doing either of those things...so what exactly, in detail, IS it doing? And is it ONLY happening in the dry mode, not in the wet mode?