arobinson1984
Fish Gatherer
Yes you will need some fresh carbon pads as they are only really effective for around 4-5 days. The carbon pads aren't really recommended to be run in the filter 24-7 unless you have a prob with tannins from bog wood etc. Once you have used carbon to remove meds from the water you'd prob be much better replacing it with another course sponge for bacteria to grow on and it would benefit you alot more than leaving a practically useless carbon pad in the filter on a day to day basis.
Andy
Andy