Join Date: Nov 2007
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hope i'm not too off-topic with this. i've rebuilt the aft head on my boat (caliber 40,yr 2000), and now i'm replacing the hoses. they seem high grade, but they show crystals on the outside, and the boat's stinky. i'm surprised by how much build-up i found inside the head pump, and in the hoses. most of it looks like grey mineral (calcium?). the hoses are constricted to maybe 50% average of their original diameter.
normal? is there something i need to do to keep this from happening again? Nigel Calder mentions stuff like this, and talks about dumping acid down the head. seems like it would be hard on the hoses, through-hulls, etc.