• Purpose-built for the Fluval G3 — drops straight into the G3's media stack; no repacking of loose resin.
• Removes up to 13,000 mg of nitrate ion — aimed at keeping freshwater nitrate below the commonly recommended 20 mg/L.
• No cycle disruption — chemical media only; doesn't touch the biological or mechanical stages running alongside it in the G3.

• Suitable for Fluval G3 filters running on freshwater aquariums with elevated nitrate.
• Not suitable as a substitute for regular water changes — it's rated as a supplementary reducer, not a replacement for husbandry.
• Not rated by Fluval for marine/reef nitrate control at this capacity — treat it as a freshwater-specific cartridge.

Fluval doesn't publish a fixed replacement calendar for this cartridge — capacity depends on your tank's nitrate load. Test freshwater nitrate periodically; once levels stop falling, or the cartridge has been running several months under normal freshwater bioload, replace it. If you're using it as a one-off fix for a nitrate spike rather than ongoing control, it can be removed once levels have settled back down.

Standard parcel delivery. As a chemical filter media, it's a consumable and isn't covered by a separate warranty term beyond your rights under Australian Consumer Law.

Does this fit the Fluval G6?

No — the G6 uses its own nitrate cartridge (Fluval A422), rated for a larger 24,000 mg capacity to match the G6's bigger media volume.

Will it affect my biological filtration?

No — this is a chemical media cartridge that sits alongside the G3's biological and mechanical stages without disrupting them.

Can I use it in a marine tank?

Fluval rates this cartridge specifically for freshwater nitrate removal; we don't have a published marine capacity figure for it.