I change mine every 7 days or earlier if they start to overflow. I can tell as my skimmer starts going nuts. I don't bother turning them inside out as I didn't really see them getting any cleaner when I did. I have about 10 that I cycle in and out and do 1 load of laundry every couple of months. No bleach or detergent.
I also have a quick look in the sock to make sure I didn't lose any starfish, snails, etc
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So many ideas, so little money!
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