Set of 60 Nylon Socks for Pool Skimmer Filtering Pond Product Description The Coopache set of 60 nylon socks for the Coopache pool skimmer is a practical solution that effectively protects the filter system from damage and costly repairs. Socks create an extra filtering layer, stopping hair, dust, oil, leaves, pine needles, insects and other small debris before they enter the pump. This keeps the impeller and shaft seal in good condition and significantly extends the service life of the entire filter system.