How often should you change cat litter? The daily scoop, the full change and what sets the date

Scoop daily, change the lot every two to three weeks with clumping litter, weekly with non-clumping. Why the advice disagrees, and how to read the tray.

Tofu, cassava, wood, corn or paper: which plant litter suits which household

What each plant litter is made of, which ones clump, what changes in your week, what to avoid, and which of the five I would put in your tray and why.