I havent tossed a single one yet after about 1 year. I bought some new ones just to have some more but the old ones dont clog any quicker than the new ones. They hold up well and the bleach obviously keeps the "pores" open. I use 100 micron.
I also put mine in the dryer on super low heat. They dry in a matter of minutes and no issues with doing so. I do a final rinse in RO/DI water before putting them in service.
One thing I notice though is that using a supplement like Seachems Reef Calcium which is polygluconated calcium (or Calcium Syrup as I like to call it) causes them to clog really quick. It also fuels organic growth (some type of evil black spunk) in the bottom of the dirty filter sock bin
