vhbw - the clever way Universal water filter for aquariums, pool skimmers, garden ponds The filter socks from vhbw filter out impurities and microorganisms for improved water quality in your aquarium, pool, garden pond, etc. The filter bags are made of high-quality polyester and are heat-resistant, breathable, shape-retaining, and light- & weather-resistant. Please note: for maximum filter performance the filter, socks should be be washed out thoroughly after 2-3 days. CONTENT OF DELIVERY: - 5x filter sock TECHNICAL DETAILS: - Ring diameter: 18 cm - Filter fineness: 150 micrometre - Length: 45 cm - Material: polyester - Colour: white - Reusable vhbw - High-quality replacement parts and accessories to prolong the service life of your electronic devices.