

🧼 Keep your tank flawless with Fluval’s precision bio-foam—because your aquatic friends deserve the best!
The Fluval U4 Bio-Foam Pad is a custom-designed replacement filter media that fits perfectly inside the Fluval U4 Underwater Filter. It provides effective mechanical filtration by capturing large debris, features an ideal pore size for optimal water flow and reduced clogging, and is suitable for freshwater, saltwater, and reptile tanks. Backed by Fluval’s decades-long innovation legacy, this durable foam pad ensures long-lasting, hassle-free filtration to keep your aquarium environment healthy and vibrant.




























| ASIN | B001XRSSJ4 |
| ASIN | B001XRSSJ4 |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #34,212 in Pet Supplies ( See Top 100 in Pet Supplies ) #387 in Aquarium Filter Accessories |
| Brand Name | Fluval |
| Color | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,577) |
| Date First Available | August 19, 2004 |
| Date First Available | August 19, 2004 |
| Department | Unisex-Adult |
| Department | Unisex-Adult |
| Directions | Insert the pad into the Fluval U4 Underwater Filter chamber. Replace as needed based on filter usage and tank conditions. |
| Included Components | All items in description |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 2.7 x 2.7 x 11 inches |
| Item Package Dimensions L x W x H | 11.14 x 2.72 x 1.54 inches |
| Item Weight | 0.04 Kilograms |
| Item model number | A488 |
| Item model number | A488 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Material | Plastic |
| Model Name | Hagen FLUVAL U4 FOAM PAD |
| Number of Items | 1 |
| Product Dimensions | 2.7 x 2.7 x 11 inches; 1.34 ounces |
| Size | U4 |
| Specific Uses for Product | Indoor |
| Style | Bio-Foam |
| Target Audience Keyword | algae-eaters, arachnids, arthropods, bats-animals, bearded-dragons, bees, beetles, betta-fish, bottom-feeder-fish, butterflies, cichlid-fish, crabs, dragonflies, fish, frogs, geckos, goldfish, hermit-crabs, iguanas, insects, invertebrate-fish, ladybugs, lizards, mollusks, newts, octopuses, rays, reptiles, salamanders, sharks, snails, snakes, spiders, tortoises, turtles |
| Warranty Description | Manufacturer Warranty |
A**R
Works great
fit like they should, some people don't like this filter in the reviews but they do a decent job and are easy to take to take out and rinse.
D**.
Great quality unless you build your own filters.
Go with the name brand. Save the headache.
N**E
Special water filters for aquariums
Can’t find these in stores any more. Happy I could find them on Amazon. They fit my aquarium filter perfectly
M**X
Not for my fish
I'm using this product for myself in the shower. I found it will remove the epidermis cells with ease. Cleaning up the product is a jif. I believe based on these facts for me, probably then, it would also make a good product for cleansing the tank.
J**E
Turtle
Great
J**N
Quality filter
I have had this filter on subscription for 2+ years and will continue to use them until my turtles water filter quits working.
D**Y
Great
These were pretty durable. They dont stay clean long tho if you have turtles.
L**S
Nice replacement sponged
Nice replacement 🧽
Y**H
Acheté pour un U4, l'eau est redevenu limpide.
M**R
Super schnell, gutes Produkt, kenne ich schon lang. Vielen Dank!!!!!!
M**N
perfekt
P**N
Necessary aquarium filter item I buy these on a regular basis. They do an excellent job of filtering the aquarium. Only last so long as they have to be rinsed every few days.
S**5
Its good if you have fish
Trustpilot
2 weeks ago
2 weeks ago