It isn't. I don't use them and it doesn't hurt the filter. Some people use them because they feel it will catch the finer stuff that the filter might not catch. Definitely not something you have to do.
Re: Newbie Question “what is adding a sock” to the skimmer
It isn't. I don't use them and it doesn't hurt the filter. Some people use them because they feel it will catch the finer stuff that the filter might not catch. Definitely not something you have to do.
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