a quick bleach dip is all it should take to sterilize, mild bleach solution, rinse until you can't smell bleach anymore, and then dechlor if you choose, in the fish room at work we use the rinse til you can't smell the bleach anymore rule and call it good. Filters are an excellent haven for nasties to build up and mature, you might just end up with nematodes again, i'd suggest sterilizing.
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