The new socks have some surfactant or other chemical on them from manufacturing - it just needs to be rinsed off. I always get some subtle "soapy" bubbles when I rinse mine...
The Reef Diaper is another option. The filter elements do not require pre-rinsing and will not cause your skimmer to overflow. The flange assembly gets reused and the light weight filter element is disposable. Let me know if you have any questions.