CHEZURAquarium decisions Dirty reusable foam may need cleaning; collapsed floss needs replacement; intact ceramic needs keeping; exhausted resin follows capacity.
Can flow be restored? Is structure intact? Is function chemical capacity? Does it hold significant biofilm?
Those answers outweigh colour or a universal date.
Run old and new together where possible and test ammonia and nitrite after substantial changes.
Do not retain disintegrating foam or unmonitorable adsorbent merely to avoid intervention.
| Situation | What to do | Why |
|---|---|---|
| Firm loaded foam | Wash and keep | Pore can recover |
| Matted floss | Replace | Structure is lost |
| Biomedia renewal | Change fractions | Retains colonisation |
After wash and keep, measure or observe Firm loaded foam again with the same method. Record Wholesale change alters communities. as well; if neither changes as expected, revisit the diagnosis before adding another intervention.
Sources include institutions, technical studies and manufacturers. Chezur separates established mechanisms from editorial decisions for home aquariums.