I have used the filter socks from J&L for some time now. Always rinse them in RODI water before use though. When dirty I hose them off, again rinse in RODI water before use. New ones or cleaned ones, they always affect my skimmer, Bullet 1, the same way. To deal with this, I put a filter sock/bag on the out flow line of the skimmer. Works great to control the micro bubbles that come from the skimmer until it settles down.
Ed
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