Mostly it was accidental. The anti-freeze was on purpose. It tasted sweet.
So what's in our city water mains?
Cryptosporidium parasites,neurological drugs, high blood pressure meds,anti-inflammatories,antibiotics,reproductive hormones.
Rust,minerals of various kinds.
Some of dis, some of dat.
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You are VERY fortunate to be alive. (assuming the antifreeze was ethylene glycol [green] not propylene glycol [pink] antifreeze.)
Ethylene glycol poisoning is caused by the ingestion of ethylene glycol, the primary ingredient in automotive antifreeze. Ethylene glycol is a toxic, colorless, odorless, almost nonvolatile liquid with a sweet taste that is sometimes accidentally consumed by children and animals due to its sweetness. Following ingestion the symptoms of poisoning progress from signs similar to intoxication and vomiting; to hyperventilation, metabolic acidosis, and cardiovascular dysfunction; and finally acute kidney failure. The major cause of toxicity is not the ethylene glycol itself but its metabolites, mainly glycolic acid and oxalic acid.
Treatment for antifreeze poisoning needs to be started as soon after ingestion as possible to be effective; the earlier treatment is started, the greater the chance of survival. Once kidney failure develops in dogs and cats, the prognosis is poor. Poisoning is relatively common, and due to its taste, children, domestic animals and wildlife sometimes consume the substance