FWIW, potable antifreeze is reportedly not good for the rubber in pumps, so I only use it for winterizing the potable water system.
From: Robert Abbott via CnC-List <cnc-list@cnc-list.com> Sent: Friday, January 07, 2022 1:45 PM To: John Read <johnprea...@gmail.com>; 'Stus-List' <cnc-list@cnc-list.com> Cc: Robert Abbott <robertabb...@eastlink.ca> Subject: Stus-List Bilge Water 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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