AquaClear 70/300 Foam Filter Insert — Replacement 3-Pack HOB Filter 152-265 L - Fluval

The AquaClear 70/300 Foam Filter Insert (3-pack) is the replacement mechanical media for Fluval's AquaClear 70 hang-on-back power filter. Its porous structure traps debris and suspended particles while hosting the beneficial bacteria that colonize the foam over time.

Filtration Role

The foam is primarily mechanical media: it captures particles and prevents waste from prematurely clogging the other media in the basket. Fluval notes it also provides biological filtration, as beneficial bacteria gradually grow inside its pore structure.

Compatibility

This insert is designed specifically for the AquaClear 70 filter (aquariums 152-265 L / 40-70 US gal) and is compatible with the newer AC Series filters. Fluval rates it for both freshwater and saltwater.

Maintenance and Replacement

Per Fluval's directions, rinse the foam monthly in water taken from the aquarium (never chlorinated tap water) and replace it about every 2 months - more often in a heavily stocked tank. Never replace all media at once: stagger replacements to preserve the beneficial bacteria colony.

Use in Marine Aquariums

AquaClear foam is saltwater-safe. In a reef setup, it serves as mechanical pre-filtration in a supplemental or quarantine filter.

Why Buy AquaClear at ReefSolution

ReefSolution is a marine aquarium specialty store based in Laval, Quebec, shipping across Canada. For complete size-70 upkeep:

• AquaClear 70 Power Filter - the matching Fluval HOB filter (152-265 L / 40-70 US gal).
• AquaClear 70 Activated Carbon - chemical media for odors, tannins and discoloration.
• AquaClear 70 BioMax - ceramic media for the nitrifying bacteria colony.

Frequently Asked Questions

How long does an AquaClear 70/300 foam block last?

Fluval recommends replacing the foam about every 2 months, with a monthly rinse in aquarium water. A heavily stocked tank may need more frequent changes.

Can I use this foam in a saltwater aquarium?

Yes. Fluval rates AquaClear foam for both freshwater and saltwater.

How do I replace the foam without disrupting the aquarium's cycle?

Fluval recommends never replacing all media at once. By staggering replacements, the bacteria on the remaining media quickly reseed the new block.