Pre-2000 the bellow was the Jabsco recomendation. Any reason why this is not still so?
(from a 2000 forum post)
"The manufacturer is, I believe, ITT Jabsco. Another name on the first page of the manual is PAR. The direct quote comes under the Maintenance/Service Instructions and is as follows: "If charging the holding tank with anti-freeze by pumping it through the toilet, use only the ethylene glycol based anti-freeze. To use petroleum based anti-freeze may cause damage to the internal rubber toilet parts." The manual came with the Hunter Owner's manual for a 1996 29.5. The Models pertaining to the manual for the head are 29090-0000 and 29120-000."
The 2012 advise is different; draining is recomended.
CAUTION: The use of anti-freeze is NOT RECOMMENDED, as it is impossible to ensure that it penetrates the complete toilet system. If, for any reason, anti-freeze is used it MUST be glycol based.
Of course, if the glycol is pulled in through the suction side, glycol will work well. Why did the wording change? I suspect PG is not good for the pump and EG is not politically correct.
The reason for the EG preference, of course, is that the joker valves and other soft parts in Jabsco heads are neoprene, which is rated for EG but not rated for PG. Other brands (Raritan and Groco) use nitrile soft parts, and the PG compatibility is better. EG could be a hazard if someone drinks the balckwater, but there should be no difference in marine toxicity or POTW treatablity.
I've used EG on the blackwater side for years (PG for potable, of course) for this reason. No problems and good joker valve life.
(from a 2000 forum post)
"The manufacturer is, I believe, ITT Jabsco. Another name on the first page of the manual is PAR. The direct quote comes under the Maintenance/Service Instructions and is as follows: "If charging the holding tank with anti-freeze by pumping it through the toilet, use only the ethylene glycol based anti-freeze. To use petroleum based anti-freeze may cause damage to the internal rubber toilet parts." The manual came with the Hunter Owner's manual for a 1996 29.5. The Models pertaining to the manual for the head are 29090-0000 and 29120-000."
The 2012 advise is different; draining is recomended.
CAUTION: The use of anti-freeze is NOT RECOMMENDED, as it is impossible to ensure that it penetrates the complete toilet system. If, for any reason, anti-freeze is used it MUST be glycol based.
Of course, if the glycol is pulled in through the suction side, glycol will work well. Why did the wording change? I suspect PG is not good for the pump and EG is not politically correct.
The reason for the EG preference, of course, is that the joker valves and other soft parts in Jabsco heads are neoprene, which is rated for EG but not rated for PG. Other brands (Raritan and Groco) use nitrile soft parts, and the PG compatibility is better. EG could be a hazard if someone drinks the balckwater, but there should be no difference in marine toxicity or POTW treatablity.
I've used EG on the blackwater side for years (PG for potable, of course) for this reason. No problems and good joker valve life.