Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
You said filters (plural) so I expect you may have 2 in one tank. If so, no problem - chuck them about every 2 weeks or so - (it's inexpensive media) - just alternate between filters- one filter at a time - a week apart. I've been doing that for years in my planted discus tank. Rinsing & re-using is not nearly as effective a clarifyng medium, as it's very difficult to rinse them very cleanly, and if you did, you'd likely also be losing a lot of the BB it contains anyway.
If you have more than 1 tank, and only a single filter in each one, then so long as the filter floss doesn't make up a large percentage of your total media - example: if it's less than 25% - you should be just fine. Beneficial bacteria replenish very quickly to resume the level necessary for dealing with your bio-load - in likely less than 24 hours or so.