acblinky I change mine within 48hrs as well . I use 100micron as well and that alone will require you to change it often. In my case if i neglect it I could wake up to 200 plus gallons spilled out on the floor. Let me exsplain. The present setup I have going on will discharge return water on the floor if the sock is not fresh. It will only dump the sump to about 2" deep of water(due to the lowest . return bulkhead) . Its the worst thing to find in the morning . Its happened so many times I have finnally learned to change them and do it offten. I clean them outside before i put them in the washer. I have extra so I dont have to go without. When I get low I will wash the used ones. I let the used ones semidry fist then turn them inside out for a high pressure rinse outside (try to get rid of most of the dirt) then A shot of bleach in the washer and on long cycle. After the wash let them dry thouroughly. When dry they should have zero bleach smell(bleach evaporates ) and I reuse the heck out of them. Too much kalkdrip with not enough calcium uptake will fowell them out 