Filter fleeces, filter wipes are available (packed per 5) for all types of filters in 5/10/25/100/150 microns. Applications: 5 - 10 - 25 microns for purification for domestic use and drip irrigation; 100 - 150 - 300 microns for assembly on suction side for filtration of coarse dirt and/or sand (check valve assembly between filter and sump). Filter fleeces from the NW-50/62/75 are also applicable to the NW-500/650/800 series. 5 / 10 / 25 / 50 / 100 microns are not reusable. 150 / 300 microns are washable