Over a decade ago a friend was way into water. He drank water all day long. He knew all about water molecules and what happens to them when they're municipally treated, he knows what other particles they contain, how the molecules are reorganized through osmotic filters, and he knows about so-called water memory. He's metaphysical about water.
Denver water is fine. I think it's great straight out of the faucet. But he thinks it's terrible and needs a lot of help.
My brother put a small filter directly onto my water spigot three apartments ago. My friend took that small one off and attached a 10-stage filter that's separate.
It really does work. But I cannot tell the difference. I know it's effective because I use it for the aquarium and the neon tetras breed in it, and they're an incredibly sensitive species. You'd think the Amazon water is hard due to all the clearly visible dark tannins, but that is just stain. All the minerals of the Amazon are locked up in the canopy, the ground holds nearly zero minerals. The water is incredibly soft.
Fast forward fourteen years to a new apartment.
Literally brand new. Nobody lived here before.
Another different friend stops by for morning coffee.
I was fixing two large cups by way of the AeroPress.
He saw me make that switch, and being a basic asshole who likes to catch others to make himself feel intellectually superior, he goes, "Oh, so you use the filter for yourself and use the regular tap for me."
I dumped out the water and re-filled it using the filter, silently admitting the fault.
Heated the water, made the two large cups of coffee separately, actually a quart each in Mason jars. The AeroPress makes espresso and that's diluted with the remaining heated water. Weird. But it's delicious as coffee gets.
Then sitting down with his cup in hand he doubles down on his accusation against me.
"I can't believe you sometimes. You filter your own water but not mine."
"Here's the thing, John. The hose for the aquarium is attached to one side of this filter and I get mixed up which side goes into the tank and which side goes to this filter."
His eyebrow went up.
"And when I drain the tank then the filter side goes into the toilet. It's held in place by the seat with a hole in it where your butt cheeks hang out and your poop passes through and sometimes splashes back up. So either the aquarium or the toilet side of the hose touches the tip of this filter and I forgot to clean it with bleach. And I realized that after I filled my cup and I was saving you from that toilet/aquarium water hazard but then went along with you since you're being an asshole about it."
Oh how we laughed. Because there really isn't that much of a danger. But I do need to remember to wipe off that tip with bleach just in case.