Effective Filter Protection: Skimmer socks capture dirt, leaves, hair, insects, and other small particles before they enter the filtration system, extending the life of your pool system. Fine Filtration: Ultra-fine mesh precisely filters out deposits such as pollen, small pebbles, and debris that could otherwise obstruct water flow and clog the filter. Universal Compatibility: Made from durable, stretchy nylon, the filter socks fit most pool skimmer baskets, filtration systems, pumps and even spas or aquariums. Reusable and easy to maintain: Thanks to the fact that they can be washed by hand, in the washing machine or under running water, the socks can be cleaned regularly and replaced every 4 to 8 weeks if necessary. Easy to install: These pool filter socks are elastic. Simply slide the socks onto the basket and they install in seconds without loosening. Specification: Weight: about 220 grams Color: white Dimensions: ‎22 x 13 x 1 cm Package includes: 30 x pool skimmer prefilter