Questions about water
in Health ·
Kyle Nelson2 said:Plastic—specifically PVC—isn't biodegradable. It takes about 500 years to break down in nature. But let's say the water actually speeds that process up and it only takes 50 years. An average bottle weighs about 50 grams.
That would be roughly 1 gram per year. So, if you store it for a month, you're looking at 0.1 grams per 2 liters, which works out to about 0.005 grams per deciliter...
If I had to try and estimate how much volume that is (since I don't know the exact density of PVC per cubic centimeter), let's just assume it's similar to the weight of water. So, 10 cc³ is about 1 liter or 1000 grams.
10 cc³/20 = 0.5 cc³ = 500 mm³ (which is the volume of the bottle).
If the bottle breaks down over 50 years, that means about 0.2% of the bottle dissolves every month.
500 * 0.2% = 1 mm³ for the whole 2-liter bottle, or about 0.05 mm³ per deciliter of water.
So, in a worst-case scenario, we’re talking 0.05 mm³ of dissolved PVC per deciliter if the water sits for a month and the bottle decays in 50 years (instead of 500). Honestly, I think it’d be closer to 0.03 mm³ max.
Just for context, a grain of cornmeal or wheat grits is usually around 0.15–0.3 mm³.
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Everything you said is technically true, but it's also true that if you leave water in a plastic jug for a certain amount of days, it picks up a plastic taste (not a smell). Your math suggests there’s nothing to fear regarding ingesting dissolved (decomposed) plastic, but when it comes to the flavor... do the experiment yourself!
I know this because whenever I head out to the mountains in the Midwest, I fill up four 10-15 liter jugs of water that I know is top-tier, but I have to pour some into glass bottles just so it doesn't end up tasting like plastic.