How often does it need to be changed or replaced ?

I cut the replacement filter in half, and replace a half of it every month.

Does any1 know if you can double up on the pads in a Fluval U4 instead of using the polyclear or polycarbon cartridges too??

You could if they fit but the filter will not work anywhere near as efficiently.

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🧼 Keep your tank pristine with the ultimate filtration upgrade!

LIGHTWEIGHT COMPACT - Slim profile (6.86 x 6.86 x 27.94 cm) and featherlight (38g) for unobtrusive filtration
EFFORTLESS MAINTENANCE - Quick-swap design means less downtime and more aquarium enjoyment
TAILORED FIT FOR FLUVAL U 4 - Seamlessly integrates with your Fluval U4 filter for peak performance
SUPERIOR MECHANICAL FILTRATION - Traps debris efficiently to keep your aquatic environment crystal clear
MULTI ENVIRONMENT COMPATIBILITY - Perfect for freshwater, saltwater, and reptile habitats—one pad, endless possibilities

The Fluval U4 Internal Filter Foam Pad is a precision-engineered replacement foam designed exclusively for the Fluval U4 filter. It delivers effective mechanical filtration by trapping debris, ensuring a clean and healthy aquatic environment. Compatible with freshwater, marine, and reptile tanks, this lightweight and easy-to-replace foam pad offers versatile, hassle-free maintenance to keep your aquarium thriving.

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TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Pet Type	Fish
Product Dimensions	6.86 x 6.86 x 27.94 cm; 38 g
Item model number	‎A488
Item Form	Foam
Allergen Information	Nut Free
Size	U4
Number of Items	1
Quantity	1
Batteries required	No
Batteries Included	No
Item Weight	38 g

FluvalU4 Internal Filter Foam Pad

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