Mechanical media
Floss, polishing pads, filter socks, coarse sponges
Traps debris before it rots. Disposable floss and socks are replaced or laundered often. Coarse sponges also hold bacteria, so rinse them in tank water instead of replacing them.
Free aquarium maintenance tool
Aquarium Filter Media Maintenance Schedule Planner
This free planner builds a dated cleaning and replacement calendar for your aquarium filter media, telling you when to rinse, inspect, rotate, or replace each mechanical, chemical, and biological medium. It staggers biomedia work so you never disturb all of your beneficial bacteria at once.
Dated 13-week planStaggered biomediaGallons or litersCalendar export
Your filter setup
Describe your tank and media
Total system water. Under 20 gallons (76 L) counts as a nano tank.
Tasks snap to your routine days when it's safe.
Your next maintenance day. Mechanical and chemical media start here; biomedia work is staggered after it.
Building your schedule…
Log water tests after filter maintenance and get reminders for every task in My Reef Log.Start tracking free
The three kinds of filter media
Chemical media
Activated carbon, GFO and phosphate removers, resins
Adsorbs dissolved compounds and eventually becomes exhausted. Replace on a schedule or when testing shows it has stopped working. Resins like Purigen can be regenerated per the label.
Biological media
Ceramic rings, bio-balls, sintered glass, K1
Home to the nitrifying bacteria that turn ammonia into nitrate. It rarely needs replacing. Rinse only a portion when flow drops, and never all at once.
How the schedule is tailored
Each medium starts from a typical interval, then the planner shortens it for heavy bioloads, reef and saltwater fish tanks, hang-on-back filters, and nano tanks under 20 gallons, and lengthens it for light bioloads, planted tanks, and canisters. Every interval stays inside a safe minimum and maximum, then snaps to your weekly, biweekly, or monthly routine when that's safe.
Why biomedia work is staggered
Sponges and biomedia hold the bacteria that keep ammonia and nitrite at zero. The planner keeps every biological task at least a week apart, rotates through one portion of each medium at a time, and moves biomedia days away from hardware deep cleans so the colony can recover between sessions.
How to use the filter media planner
Step 1
Describe your tank
Choose the tank type and filtration setup, enter the volume in gallons or liters, and pick a bioload.
Step 2
Set your routine
Select how often you currently do maintenance so tasks land on the days you already work on the tank.
Step 3
Check the media you use
Tick the mechanical, chemical, and biological media in your filter, then pick a start date.
Step 4
Follow the staggered plan
Work through the dated tasks, keep biomedia days separate, and copy, print, or add the plan to your calendar.
Filter media maintenance FAQ
How often should I clean aquarium filter media?
It depends on the media. Replace filter floss or fine pads about every 1 to 2 weeks and swap filter socks every 3 to 7 days. Rinse coarse sponges every 2 to 6 weeks in removed tank water. Leave biological media alone until flow drops, usually every 2 to 4 months, and then rinse only part of it.
When should I replace activated carbon and phosphate media?
Most keepers replace activated carbon and GFO or other phosphate removers every 3 to 6 weeks, sooner with a heavy bioload. Spent carbon stops adsorbing and can't be usefully recharged at home. In reef tanks, test phosphate after each change so it doesn't crash to zero.
Should I ever replace all of my biological filter media at once?
No. Most of the nitrifying bacteria that process ammonia and nitrite live on sponges and biomedia. Replacing or scrubbing all of it at once can cause an ammonia spike, a mini-cycle. Ceramic rings and bio-balls rarely need replacing; if they crumble, replace at most a third at a time, several weeks apart.
Can I rinse filter media in tap water?
Not biological media or sponges. Chlorine and chloramine in tap water, and any soap residue, kill beneficial bacteria. Rinse them gently in water removed from the tank during a water change. Disposable floss and socks headed for the laundry don't need this care.
Why does ammonia rise after I clean my filter?
Usually too much bacteria was removed at once: all the media was cleaned, it was rinsed in tap water, or it dried out. Test ammonia and nitrite 24 to 48 hours after biological work. If either rises, pause filter cleaning, do a water change, and feed lightly until readings return to zero.
Related tools
Aquarium Cycle Chart Generator
Track ammonia, nitrite, and nitrate while new or replaced media matures.
Water Change Calculator
Plan water change volume and frequency to pair with filter maintenance.
Fish Tank Stocking Calculator
Estimate bioload from your fish list and filtration capacity.
Protein Skimmer Size Calculator
Size a skimmer to reduce the organic load reaching your filter media.