8 April 20007
Head Odors & Preventive Maintenance of the Jabsco Quite Flush
Head odors seem to only be a problem in the forward head. In my
experience the single largest cause of head odors in the forward
head is an incompetent (medical term for not completely sealing)
joker valve. The Jabsco joker valves (the valve that prevents reflux
of toilet waste from the vertical hose/pipe that goes from the toilet
toilet macerator pump outlet to the holding tank) come in tri-cuspid
and bi-cuspid models each carrying the same part number. I
haven't been able to determine if one type is more susceptible to
regurgitation than the other. The soft rubber of the joker valve is
easily contaminated with salt and calcium deposits that render
them susceptible to leakage. Because the forward head has a longer
hose from the macerater pump to the holding tank it also has a
taller column of waste water (more mass = more pressure against
the valve) that the joker valve has to check. It also requires greater
quantities of water to adequately flush so that there isn't grooslly
contaminated fluid standing in the pipe.
Incompetent valve diagnosis: Flush (empty) the toilet bowl completely,
then let it sit for a couple of hours, if there is then ANY fluid in the
bowl after this waiting period it is regurgitated waste water and I
guarantee it will have a bad odor. Replace the joker valve and see
if that doesn't fix your smell problem.
As a matter of careful head and holding tank service I flush the system
with fresh water frequently (use the shower hose) and treat the system
with vinegar water periodically (weekly) to help mitigate salt deposits.
I do this by adding a cup of white vinegar (acetic acid) to a completely
full toilet bowl of fresh water, then emptying the bowl so that the
vinegar water stands in the toilet-to-holding-tank hose for an hour
Also, replace the electric motor shaft seal yearly to prevent leakage
of water onto the motor as a very expensive motor it is.
Gary Silver Amel SM2000 Hull # 335