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Yes. Because it pulls the detritus out of the water. Otherwise, where will it go except build up?
People that say that they are Nitrate factories are full of Bologna.
Yes, because they pull out a lot of waste and detritus.

YES!
I change mine out every 2-3 days, the goal is similar to the skimmer, remove excess nutrients before it breaks down and adds to the volume of nitrates in the system. On top of that they really polish the water nice!
I have 10 at the moment, so after the swap, I rinse it out, and save them up and run a load in the washer every 2 weeks or so. I do run an empty rinse cycle before to remove any excess detergents that may be in the washer. Then I throw them in with warm water, and some hydrogen peroxide, when they are done I hang dry them and they are as good as new!
I usually do this when the wife is out and then throw a bleach load in afterwords, I think she assumes I hand wash them in the utility sink in the laundry room....
Anyone using bleach to clean there socks try hydrogen peroxide, it is much safer and works well.

