200 micron here. I try to change them every other day, but most times I change them when they clog, and start to overflow which is at about the 4th. day. I use 2 at a time, have 10 so they get washed at the 4th. change out.
I turn them inside out, wash them in the washer with hot water bleach. The cycle I put them through is 1st. with bleach, pre-soak, wash, double rinse. 2nd. same as 1st. without bleach. Use to dry them in the dryer (my dryer has NEVER had softener sheets in it), but most times they just sit in the washer with the door open, and they dry just the same as if they were hung to dry.