Aquarium Filter Replacement Sponges – Square or Round, 2-Pack & 6-Pack

Keep your aquarium filter supplied with replacement biochemical filter sponges. These replacement inserts are available in square or round shapes, with 2-piece and 6-piece pack options to match compatible aquarium filtration equipment.

Features

• Replacement filter media: Sponge material helps trap suspended particles as water passes through a compatible filter.
• Two shapes: Choose square or round to match your existing filter insert.
• Multiple pack sizes: Select 2 or 6 sponges for routine maintenance and replacements.
• Filter compatibility options: Supplier-listed categories include 4W, 6W and 15W-and-above equipment.
• Biochemical cotton: Porous filter sponge material suitable for use as mechanical filtration media in compatible setups.

How to choose

Select the wattage category, shape, and quantity from the variant menu. Wattage alone does not guarantee fit. Compare the replacement sponge's dimensions and shape with your current filter before ordering.

Care instructions

Rinse replacement media before installation. When cleaning established filter sponges, gently rinse in removed aquarium water to help preserve beneficial bacteria; avoid soap or household cleaners. Replace media as needed without changing all biological filter media at once.

Package includes: 2 or 6 replacement filter sponges, depending on your selected option. Aquarium filter equipment is not included.

Shipping options and estimated delivery times are shown at checkout. Products may ship separately when an order contains items from multiple suppliers.

Returns are accepted according to our posted return policy. Items must meet the stated eligibility and condition requirements.