---
product_id: 256667469
title: "Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks"
brand: "penn-plax"
price: "€ 74.82"
currency: EUR
in_stock: true
url: https://www.desertcart.sk/products/256667469-penn-plax-clear-free-premium-under-gravel-aquarium-filter-ugf
store_origin: SK
region: Slovakia
---

# Air-driven filtration Easy maintenance Aerates while filtering Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks

**Brand:** penn-plax
**Price:** € 74.82
**Availability:** ✅ In Stock

## Summary

> 🐠 Dive into clarity with the ultimate filtration solution!

## Quick Answers

- **What is this?** Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks by penn-plax
- **How much does it cost?** € 74.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/256667469-penn-plax-clear-free-premium-under-gravel-aquarium-filter-ugf)

## 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

- • **Complete Kit:** Includes everything you need for setup – just add an air pump!
- • **Minimalist Design:** Less clutter, more clarity – keep your tank looking pristine.
- • **Dual Functionality:** Filter and aerate your aquarium simultaneously for a thriving aquatic environment.
- • **Comprehensive Filtration:** Biological, chemical, and physical filtration for crystal clear water.
- • **Old School Meets Innovation:** Experience the charm of classic filtration with modern efficiency.

## Overview

The Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter is designed for 20-29 gallon tanks, providing efficient air-driven filtration and aeration. This filter combines biological, chemical, and physical filtration methods, ensuring a clean and healthy environment for your aquatic life. With easy maintenance and a minimalist design, it’s the perfect choice for both freshwater and saltwater setups.

## Description

Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks

## 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 20 (long) – 29 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 2 Filter Plates, 2 Adjustable Lift Tubes, 2 Straight Airline Tubes, 3 Filter Plate Connecters, and 2 Replaceable Filt-a-Carb Activated Carbon Media Cartridges.
- MEASUREMENTS: Each Filter Plate Separately = 14” (W) x 11.1” (D) / Filter Plates Together = 28” (W) x 11.1” (D) / Each Lift Tube at Filter Plate Base = 13” – 16”

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 71.12 x 28.19 x 43.18 cm; 566.99 g |
| Item model number | CFU29 |
| Pet Life Stage | All Life Stages |
| Allergen Information | Codfish Free |
| Color | Blue |
| Size | 109.78 L |
| Number of Items | 1 |
| Quantity | 1 |
| Specific Uses | Indoor |
| batteries required | No |
| Batteries Included | No |
| Item Weight | 567 g |

## Images

![Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks - Image 1](https://m.media-amazon.com/images/I/91kXCC+rZoL.jpg)
![Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks - Image 2](https://m.media-amazon.com/images/I/81u-Bhg5DvL.jpg)
![Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks - Image 3](https://m.media-amazon.com/images/I/71xiDcuCFqL.jpg)
![Penn-Plax Clear-Free Premium Under Gravel Aquarium Filter (UGF) – Freshwater and Saltwater Safe – Suitable for 20 – 29 Gallon Tanks - Image 4](https://m.media-amazon.com/images/I/71syzVPbJvL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: does this filter come with everything it needs to be put in aquarium or do i need additional items?**
A: You will need an air pump and 2 way gang valve to regulate the air. The good thing about these filters are almost no maintenance. If you do decide to use a power head, choose carefully. Some power heads may be to disruptive to the fish. If you decide to get smaller fish I personally would not use a power head. Stronger fish can swim against the current that a power head can produce. I hope this helps more than confuse. Oh, and one more thing...this may be a no-brainer...gravel designed for aquariums.

**Q: can this be used alone for my 29 gallon tank? i don’t like the noise of a hang over filter and i can’t use an internal filter bc of the flow strength**
A: Yes, I have a 29 gallon tank and this is the only filter I use. The water is sparkling clean, really like this.

**Q: My aquarium dimensions are 35” x 17”. Wich model is recommended?**
A: Doesn't look like they make one specifically for that size aquarium base. However, you may be able to purchase two units (packages) of the 20L/29 gal. size or the15/20H gal. size and snap the plates together. You may end-up with an extra plate when you're finished, but that's no big deal. Look at the sizes of each of these and figure out which combination would best cover the bottom of your tank. Good luck.

**Q: On my 29 gal bowfront, This filter is just a tad too wide at the front (left & right). Is it possible to trim the 2 corners and still work properly?**
A: The filter tubes can be cut down, so they fit properly. If you plan on trimming it because it is too wide, I suggest trimming only the front corners. I would make a template by setting the aquarium on top of the plate, so you get a good idea of how much to cut or trim off.  Be sure to sand the ruff edges Please note I also use graven for mine which does cover the plate before I add my water. It will still work fine as a bit of gravel gets down around the edges anyway! Good luck and enjoy.

## Frequently Bought Together

- Penn-Plax Undergravel Aquarium Filter for 20 (Long) - 29 Gallon Tanks – Two 14” x 11.1” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks
- PENN-PLAX Standard Airline Tubing for Aquariums – Clear and Flexible – Resists Kinking – Safe for Freshwater and Saltwater Fish Tanks – 8 Feet
- Tetra Whisper Easy to Use Air Pump for Aquariums (Non-UL)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-22*