I use the 50 micron washable filter pads. I change them out every other day and wash them in the washer with bleach. I do one wash with bleach and two rinse and spins with de-chlorine. No problems. You should look else where for your alge problem.
First use only RO/DI filtered water for your salt mix and top off. Get as much flow through the tank as you can, add a pump or two (no dead spots). Next run some type of phosphate removing product and check or replace your lights (spectrum shift). Then the best thing to do is weekly water changes to drop the nitrate levels so the alge doen't have any fuel to feed it self. This should help with your alge problem but it will take some time. Good luck!