filtersock

dumb question but do more filter socks mean less replacement, if one sock is replaced once a week, can that period be increased using two socks?

I have a 120 gallon freshwater tank that was recently set up things are going fine but having a little more of an issue bringing ammonia and nitrite levels down. So I have a few questions on not just what could help but also what affects the increasing levels I have been starting to get here and...

fairly new to hobby how frequent do you replace filtersock. Just placed some ick treatment and wanted to know if I should replace the sock to help get rid of any ick/ich treatment trace still in the filtration.