Offhand, I can think of two uses involving a sock - one is a "scum sock" which is made to fit over your skimmer basket that catches smaller debris - this is probably what you're thinking of. You can buy these online or at a pool supply store. This just reduces the amount of crap that goes to the filter. Make sure to rinse this out frequently as it will catch a lot of crap.
The other use is for dissolving chlorine stabilizer - this would use any old sock but you wouldn't need to worry about this until after your conversion is complete. For now, make sure you have the bleach calc program and a good drops-based test kit.
If you need it, the bleach calc program is here:
http://home.earthlink.net/~mwsmith70...achCalc262.exe
Good luck!
Peter
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