John,
I don't use the -35C windshield washer fluid in the potable waterlines,
fresh water tank....only in the bilge lines and the head shower
overboard line. In the potable water lines I use plumber's antifreeze.
In the engine, I use full strength diesel antifreeze 50% - 50% with water.
Rob Abbott
AZURA
C&C 32 - #277
Halifax,N.S.
On 2022-01-07 11:50 a.m., John Read wrote:
A quick internet search indicates caution using windshield washer
fluid in potable water lines. Most fluids use methanol also known as
methyl / wood alcohol to prevent the freezing. Methanol is highly
poisonous and can cause blindness. It may be ingested through air,
skin or mouth. May also be corrosive
The water system antifreeze are usually based on propylene glycol
which is considered generally safe unless ingested in large
quantities. Propylene glycol rarely causes toxic effects, and then
only under very unusual circumstances. Propylene glycol is a
*Generally Recognized as Safe* (GRAS) food additive that is widely
used in cosmetics. In certain medicines, cosmetics, and food products,
propylene glycol acts as solvent.
In both cases, thorough rinsing of the potable system is recommended
John Read
Legacy III
1982 C&C 34
Noank, CT
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