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wagwang 3 hours ago

Pfas are measured in ppb or even ppt

daedrdev 2 hours ago | parent | next [-]

Good thing there are 3*10^21 atoms of H2O in a water drop

Aloisius 11 minutes ago | parent | next [-]

PFAS are expressed as a mass fraction, not mole fraction.

wagwang 2 hours ago | parent | prev | next [-]

Ok and there are around that many atoms of pfas per tear drop?

2 hours ago | parent | prev [-]
[deleted]
terminalshort 3 hours ago | parent | prev [-]

And water supply is measured in km^3

wagwang 2 hours ago | parent [-]

so 1 liter of eye drop per 1ppt of km^3

terminalshort 2 hours ago | parent [-]

That would be 1 liter of the active ingredient, not 1 liter of the eye drop. Also I don't believe that 1 ppt of this stuff is harmful when people are putting it directly in their eyes without severe harm.

jaggederest 2 hours ago | parent | next [-]

There's only a single ingredient, these eyedrops are 100% pure PFAS

And people put asbestos on their christmas trees back in the day - I don't think "obvious harm" is a high enough standard.

terminalshort 2 hours ago | parent [-]

I think obvious harm at 1 trillion parts per trillion is a pretty good standard to meet if you want to claim harm at 1 part per trillion.

wagwang 2 hours ago | parent | prev | next [-]

Maybe, maybe not, maybe like teflon, the real poison is an intermediate ingredient, but I think its bullshit that we're just creating chemicals that linger in our water supply for eternity. You literally cannot find anyone in America without traces of the dangerous variant of the PFAS in their blood stream. Like every sip of water is some ridiculous dupont cocktail and we have to tolerate it because people have dry eyes and want non stick pans. Why cant you just use theratears?

cyberax an hour ago | parent [-]

> You literally cannot find anyone in America without traces of the dangerous variant of the PFAS in their blood stream.

You also can't find anybody in the world without traces of lead, arsenic, uranium, radium, and other chemical elements in their blood.

> Why cant you just use theratears?

Because they don't work.

OutOfHere 2 hours ago | parent | prev [-]

It's most definitely going to accumulate inside the body, although slowly.