This means removing and wiping off the ceramic cylinder. If the water flow has slowed, scrub the cylinder with a toothbrush to restore normal output. Some ceramic elements contain silver to limit the growth of bacteria, fungi, and algae within the filter, which keeps you from having to sanitize it after cleaning. Note, however, that the silver isn't intended as a water treatment by itself. This means removing the filter membrane and scraping or brushing it clean.
Most people replace their membrane when it turns gray.
After removing the membrane, you must sanitize it with a bleach solution or by boiling. Start with the cleanest water you can Try and not make your filter work harder than need be. Use pools rather than large currents, because they stir up sand and debris. Always hold the intake hose above ground so you won't suck up any mud, muck, or leaves. Let water settle Dip up a container of water and set it aside to let the suspended solids settle out.