Originally Posted by fishwonder
Put in your new media and cut out the filter pad from the cartridge. Do not rinse it out. Jam it back into the filter and let it run for 3+ weeks. Hopefully your new media is foam or plastic pot scrubbers.
I did this with my HOB
filter and what I did was take one used cartridge (it is supposed to use 2) and put it in a solo cup with the Bioballs (new media) and soaked in tank water. Then put 2nd bag of new media in filter with other old cartridge. Ran filter and added fish immediately. Next day swapped out old cartridge in filter with the Bioballs that sat in the solar cup and bingo bango - cycled and ready. My readings never changed.
I used sponges and Bioballs and my water looks awesome!