I dunno if I've mentioned this before, but I'm a crazed redneck who lives in the woods. I have an artesian well and the groundwater here is hard as a black metal album. I have not one but two filters between it and what I drink. The first is a grit filter, the second is a taste & odor (charcoal) filter. They needed to be changed when I locked myself in 9 weeks ago, and I was out of spares Today I arranged pickup of new filters and replaced them. This is what the grit filter looked like when I removed it:
The filters are pure white when new. For two decades, I have snarkily referred to the filter swapping process as "changing the house's tampon" because I haven't matured terribly much in the last ~35 years. Mr. Frog was not at all impressed the proceedings.