These skimmer filter Scum-Socks eliminates unpleasant mess in your skimmer! Scum-Socks slip over your skimmer basket to catch all debris, hair and leaves, preventing them from reaching your pools filter. When using the skimmer Scum-Socks they provide longer filter cycles and fewer cleanings. Simply, place Scum-Socks inside the skimmer basket and stretch the sock over the basket. Empty and replace scum-socks regularly (at least 1-2 times per month). Sold in packs only / 12 packs per case