Fluval Chemical Cartridge G6

• Granulated chemical media – the same G-Series cartridge format used across the range, sized for the G6's larger housing.
• Top-loading cartridge – accessed from the top without disturbing the mechanical or biological stages beneath.
• Sealed, no-mess format – no loose granules to spill during a change.
• Purpose-built for the G6 – shaped for the G6's chemical stage housing only, not interchangeable with the G3's smaller cartridge.

This cartridge is sized specifically for the Fluval G6 (rated for aquariums 300–600 L / 80–160 US gal) and its chemical-stage housing. It does not fit the smaller G3, which uses its own, smaller chemical cartridge (Fluval A425) – check your filter's model plate before ordering.

Suitable for freshwater and marine aquariums running a G6. Not a stand-alone filter – it replaces only the chemical stage; the G6's mechanical pre-filter and G-Nodes biological media are separate consumables.

Fluval's G-Series guidance calls for the chemical cartridge to be changed every 15–30 days depending on media load and bioload – sooner in a heavily stocked or recently medicated tank. The mechanical pre-filter runs on a separate, more frequent 14-day cycle and is a different consumable to this one.

How do I know when it needs changing?

Watch water clarity rather than the calendar alone – if clarity drops before the 15–30 day mark, change it early; the G6's flow indicator will also flag reduced flow if an earlier stage needs attention.

Can I use this in a G3?

No – the G3 takes its own, smaller chemical cartridge (Fluval A425); the two aren't interchangeable.

What does it actually remove?

Granulated chemical media of this type targets general water polishing and clarity rather than one specific contaminant – Fluval also sells dedicated ammonia, nitrate and phosphate cartridges for the G-Series if you need targeted removal.

Covered by Fluval's standard consumer guarantee in addition to your rights under Australian Consumer Law. Standard freight class.