I use a 1/2g plastic ice cream container/lid. Add 1/8 cup of bleach, fill almost to top with hot water, add sock. Let soak for 24hrs, rinse well, let air dry till ready to use again.
Excuse me? Your talking to a mother who used cloth diapers on her child. Much knowledge when it comes to using bleach :) Used correctly it is one of the safest substances to use for cleaning Filter Socks.
I just turn mine inside out and into the washer on heavy duty cycle and 2nd rinse cycle. No bleach just water. Then when done back in the tank they go.
we wash ours in hot water with about 1/8 cup bleach, extra rinse cycle, then we soak them in a 10g tub with RODI water with Prime. Where they sit soaked until we need to do the sock change.