---
product_id: 79802970
title: "Penn-Plax Under Gravel Filter System-For 40-55 Gallon Fish Tanks&Aquariums(Pack 2)"
brand: "penn-plax"
price: "€ 90.28"
currency: EUR
in_stock: true
reviews_count: 6
url: https://www.desertcart.ie/products/79802970-penn-plax-under-gravel-filter-system-for-40-55-gallon
store_origin: IE
region: Ireland
---

# Crystal-clear filtration Easy maintenance Aeration system Penn-Plax Under Gravel Filter System-For 40-55 Gallon Fish Tanks&Aquariums(Pack 2)

**Brand:** penn-plax
**Price:** € 90.28
**Availability:** ✅ In Stock

## Summary

> 🐠 Dive into clarity and simplicity!

## Quick Answers

- **What is this?** Penn-Plax Under Gravel Filter System-For 40-55 Gallon Fish Tanks&Aquariums(Pack 2) by penn-plax
- **How much does it cost?** € 90.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/79802970-penn-plax-under-gravel-filter-system-for-40-55-gallon)

## Best For

- penn-plax enthusiasts

## Why This Product

- Trusted penn-plax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual Functionality:** Filter and aerate your aquarium simultaneously for a thriving aquatic environment.
- • **Complete Kit Included:** Everything you need for setup right out of the box.
- • **Simplicity at Its Best:** Fewer moving parts mean less hassle and more time enjoying your fish.
- • **Comprehensive Filtration:** Biological, chemical, and physical filtration for a balanced ecosystem.
- • **Old School Meets Innovation:** Experience the charm of classic filtration with modern efficiency.

## Overview

The Penn-Plax Under Gravel Filter System is designed for 40-55 gallon aquariums, providing efficient air-driven filtration and aeration. This system includes essential components for easy setup and maintenance, ensuring a clean and healthy environment for your aquatic life.

## Description

Penn-Plax Under Gravel Filter System-For 40-55 Gallon Fish Tanks&Aquariums(Pack 2)

## Features

- NOTHING LIKE OLD SCHOOL: The Clear-Free Premium Under Gravel Filter is air driven and utilizes an Air Pump (not included) to cycle crystal clear water throughout your aquarium, while keeping a crisp and neat look inside. This means there’s less “moving parts,” making for simplistic and easy maintenance. This filter is suitable for most 40 – 55 gallon aquariums.
- BIOLOGICAL, CHEMICAL, AND PHYSICAL FILTRATION: As air is pushed through the Air Stones and rises through the Lift Tubes, water is gently suctioned through gravel and the filter plates, allowing both air and water to pass through the Filt-a-Carb Activated Carbon Cartridges. When water continues to be drawn through, anaerobic bacteria collects and colonizes within the gravel and filter plates.
- ALSO AERATES YOUR TANK: Since the Clear-Free Premium Under Gravel Filter is air driven through the use of Air Stones and an Air Pump (not included), it also aerates your tank. In essence, your aquarium is being filtered and aerated at the same time, though the same system. It’s a filter and bubbler in 1.
- ITEMS INCLUDED: The Clear-Free Premium Under Gravel Filter includes 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.
- MEASUREMENTS: Each Filter Plate Separately = 11.25” (W) x 11.25” (D) / Filter Plates Together = 45” (W) x 11.25” (D) / Each Lift Tube at Filter Plate Base = 13.25” – 16.5”

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Penn Plax, INC. |
| Item model number | CFU55 |
| Product Dimensions | 29.21 x 6.35 x 29.21 cm; 916.26 g |
| ASIN | B003UTNOU6 |

## Images

![Penn-Plax Under Gravel Filter System-For 40-55 Gallon Fish Tanks&Aquariums(Pack 2) - Image 1](https://m.media-amazon.com/images/I/819cRGofPsL.jpg)

## Available Options

This product comes in different **Style Name** options.

## Questions & Answers

**Q: 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**
A: 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.

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

**Q: Is it 11.5' square as in the decription or 13" as in the picture?**
A: 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.

**Q: What size should i get gor a 36 gallon tank**
A: 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

## Customer Reviews

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    Good
  

*by T***L on Reviewed in India on 15 October 2020*

Good

### ⭐⭐⭐⭐⭐ 







  
  
    Works great!
  

*by W***K on Reviewed in the United States on 8 October 2024*

We bought these to put in our 75 gallon tank so that our fancy goldfish had extra filtration. We already use a canister filter for them but I had an extra air pump from when I got an under gravel added on to my 55 tropical tank (because I'd accidentally ordered 2). I use this same brand in that one, as well!The price is awesome and they work amazingly. Helps keep the water oxygenated and they fit perfectly. Once you get your gravel or substrate in you don't even notice them.Also, these don't make noise: whatever noise you hear comes from your air pump, and if the air is too strong or you have a crappy pump, then yes, they're loud-but do it right, with air line adjustable knobs and a good quality pump and you'll have no problem. The lines were great and they gave plenty with the set up to get it up and running! Will be back to buy another one soon since I'm setting up a 3rd tank soon!

### ⭐⭐⭐⭐⭐ 







  
    Tal como lo necesitaba
  
  

*by R***O on Reviewed in Mexico on 11 October 2023*

Es del tamaño perfecto y con los accesorios necesarios

## Frequently Bought Together

- 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)
- AQUANEAT Aquarium Air Pump 300GPH, for up to 200 Gallon Fish Tank, Powerful Hydroponic Aerator Pump with Tubing, Air Stones, Valves
- Penn-Plax Standard Airline Tubing for Aquariums – Clear and Flexible – Resists Kinking – Safe for Freshwater and Saltwater Fish Tanks – 25 Feet

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-01*