Grey/white spots on the bottom of a Brita filter, possibly mold? : r/whatisthisthing

Black stuff in cat's water fountain…mold or from filter? : r/cats

Why does my brand new Brita water pitcher have white sediment at the bottom floating around in the water? : r/NoStupidQuestions

What is the Black Stuff on my Water Bottle (And is it Dangerous?) - TheRoundup

Does this look like mold in my tea kettle or just burns? ( NOT asking for ID just is it mold or not ) : r/Mold

White wispy floating material in the water coming from my fridge dispenser. Unsure of age of fridge. Changed filter, flushed water, this stuff appeared. Changed filter to different brand, flushed again, still

Help! Do y'all know what this white looking stuff is inside my straw from my water bottle??? : r/CleaningTips

5 Reasons Why Brita Filters Get Algae - And How To Prevent It - Water Purification Guide

A bit of sticky? porous? vaguely nail polish reminiscent residue on my collection box : r/simplynailogical

Black stuff in cat's water fountain…mold or from filter? : r/cats

Is this mold? Found in Brita Filter : r/Mold

Mold or minerals? I opened up my water filter pitcher today to look at the filter piece and saw this. Any idea what is accumulating inside the filter? : r/Whatisthis