Hello! i have a 55 gallon tank. how does this filter work? does it come with everything i need? and if there is a video on it please send it. thanks

Thank you for your question. This filter has a plastic filter plate which lies under the gravel of the tank. This plate allows water to flow freely under the gravel. Water is drawn through the gravel and cleaned removing bateria and debris. In order for this air filter to work properly you will need an air pump as well as airline tubing. We like the Air Pod Pump B003DHYB52 and B0002563MW for air tubing. We don't have a video at this time but will have one soon.

Can i configure this to fit a container that is 12.5" x 12.5"? Can experts recommend something better if not?

The 40/55 comes with four plates. Each plate has two tube attachments. One plate would fill a 12.5". Even if it were a little big you could score it (its plastic) and make it fit.

Is it 11.5' square as in the decription or 13" as in the picture?

If you're getting it for a 55 gal aquarium the best I can tell you without tearing mine up out of my tank is that its perfect for the 55g , I've got them in my 10g , 39g bow front , 55g , and one in my 60g acrylic.

What size should i get gor a 36 gallon tank

I have a 55 gallon tank and I used all the supplies flooring pieces, I think using this you may only require 3 of the flooring pieces possibly two if it’s a taller tank and not a show tank

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Penn-Plax Undergravel Aquarium Filter for 40-55 Gallon Tanks – Four 11.25” x 11.25” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks (CFU55)

Product ID: 2119026

💨Air-driven filtration & aeration

🪨4 sturdy 11.25" filter plates

♻️Biological + chemical + physical filtration

Description

💧 Elevate your aquarium game with clean water and effortless style!

TRIPLE FILTRATION POWER - Combines biological, chemical, and physical filtration for crystal-clear, balanced aquatic environments.
SEAMLESS 4 PLATE COVERAGE - Covers 40-55 gallon tanks with precision-fit plates for maximum filtration surface area.
DUAL ACTION AIR PUMP SYSTEM - Circulates water and oxygenates simultaneously, reducing maintenance and boosting tank health.
VERSATILE FRESH SALTWATER USE - Engineered to support diverse ecosystems, from freshwater community tanks to vibrant saltwater setups.
EFFORTLESS INSTALLATION MAINTENANCE - Minimal moving parts mean quick setup and hassle-free upkeep—perfect for busy pros.

The Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter is a robust, air-driven filtration system designed for 40-55 gallon tanks. Featuring four 11.25" filter plates and adjustable lift tubes, it delivers biological, chemical, and physical filtration while aerating your tank simultaneously. Suitable for both freshwater and saltwater aquariums, this low-maintenance filter ensures crystal-clear water and a healthy aquatic environment with minimal fuss.

Specifications

ASIN	B003UTNOU6
ASIN	B003UTNOU6
Age Range Description	All Life Stages
Best Sellers Rank	#14,110 in Pet Supplies ( See Top 100 in Pet Supplies ) #94 in Aquarium Filter Accessories
Brand Name	Penn-Plax
Color	Blue
Customer Reviews	4.4 4.4 out of 5 stars (8,319)
Date First Available	July 6, 2010
Date First Available	July 6, 2010
Directions	Wash with warm water before placing in aquarium.
Included Components	4 Filter Plates, 4 Adjustable Lift Tubes, 4 Straight Airline Tubes, 9 Filter Plate Connecters, and 4 Replaceable Filt-a-Carb Activated Carbon Media Cartridges
Item Dimensions LxWxH	11.5 x 2.5 x 11.5 inches
Item Package Dimensions L x W x H	11.8 x 11.42 x 2.8 inches
Item Weight	2 pounds
Item model number	CFU55
Item model number	CFU55
Manufacturer	Penn Plax, INC.
Manufacturer	Penn Plax, INC.
Model Name	CFU55
Number of Items	1
Product Dimensions	11.5 x 2.5 x 11.5 inches; 2.02 pounds
Size	40 - 55 Gallons
Specific Uses for Product	Indoor
Style	40 - 55 Gallon
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	Amazon Policy

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