Windchaser

This biowheel filter has 2 carbon filtration medias.

Would it be best if we were to replace one filter media at a time?

lilsoccakid

i would strongly suggest one at a time, to prevent a mini-cycle

Windchaser

Great, and what sort of delay on swapping out the 2nd one?

jsalemi

Well, since the biowheel filters have most of the bacteria living in the wheel, changing both at the same time shouldn't be a problem. If you prefer to split the change, waiting a week between filter changes should be ok.