The afilter.nl membranes are available in two types of filtratieon microfiltration and ultrafiltration & nanofiltration and reversed osmose. As you want to use an afilter.nl membrane to catch bigger particles we call that microfiltration and ultrafiltration. These membrane charactherize themselves with a high possible flow with a low differential pressure. For separation of salts out of water nanofiltration and reversed osmose is used. These afilter.nl membrane has got now holes but work on diffusion and have a low flow capacity and the needed working pressure is much higher.