Each package contains pack-10 value pool skimmer socks. When dirty, rinse with a clean rubber hose and reuse or discard (if heavily contaminated). Every 4-8 weeks, new socks are replaced. Do not use or dissolve a chlorine tablet in your basket. (the socks will weaken) Easy to install: The stretchy fabric can fit your basket perfectly, so it won't be loose, but you can install and replace in a short time. The socks of skimmer protect the pump impeller and shaft seals, which will block and prolong the service life. Using durable elastic and ultra-fine nylon mesh, these pools are used as nets to attract and trap leaves, grass, hair, scum, oil, pine needles, pollen, insects, pool filtration systems and other small debris to prevent clogging. Socks shallow skimmer will be more convenient and reduce damage.