I think this is a pretty neat idea! For some smaller pots I use a tray filled with water (linked below) for them to butt-chug and then I move them to an empty tray to dry before putting them back in their place

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4” plant pot to help with scale.

I’ve seen others use their bathtub but I like the idea of not risking dirt/perlite/etc. clogging up the drains. Depending on your drain you could use a metal debris catcher thingy like I have in my laundry room sink (I found mine at the dollar store):

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