I suck mine out and refill a few times with fresh water.  Then a shot of
bleach down the toilet to clean the lines and then some more flushing.  All
of this is completed with a shot of glycol.  I have a vacu-flush so vacuum
tank and lines are longer and more critical.  Once glycol is in the tank I
use the macerator pump to pump the tank dry...everything has been flushed,
cleaned, freeze protected, and emptied.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD
Do people worry about emptying the holding tank for winter storage?  Both
boats I have bought had stuff left in the holding tank when I took
ownership, and there was no damage, so I have presumed that with plenty of
expansion room in the tank, it won’t be a problem.  I have flushed some
antifreeze through the lines, but the tank is about 1/3 full at present.
Has anyone ever had freezing damage to their tank?  Thanks- Dave

Aries
1990 C&C 34+
New London, CT



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