Well, the bleach does get them whiter too. I used to use pleated filters back years ago and they were soaked in bleach solution to clean and open the "pores" . The same should apply to the filter socks to an extent anyway. I have read about some reefers that wash in hot water only and some of them have claimed that they clog easier after a while. Mine dont clog any quicker than the new ones so I assume that the bleach helps.
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