---
product_id: 8829118
title: "Penn-Plax Undergravel Aquarium Filter for 10 Gallon Tanks – Two 9.5” x 9.5” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks"
brand: "penn-plax"
price: "฿2472"
currency: THB
in_stock: true
reviews_count: 12
category: "Penn Plax"
url: https://www.desertcart.co.th/products/8829118-penn-plax-undergravel-aquarium-filter-for-10-gallon-tanks-two
store_origin: TH
region: Thailand
---

# Air-driven system for simultaneous filtration & aeration 2 x 9.5" filter plates for max surface area Biological + chemical + physical filtration combo Penn-Plax Undergravel Aquarium Filter for 10 Gallon Tanks – Two 9.5” x 9.5” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks

**Brand:** penn-plax
**Price:** ฿2472
**Availability:** ✅ In Stock

## Summary

> 💧 Clear water, happy fish — filter smarter, not harder!

## Quick Answers

- **What is this?** Penn-Plax Undergravel Aquarium Filter for 10 Gallon Tanks – Two 9.5” x 9.5” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks by penn-plax
- **How much does it cost?** ฿2472 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/8829118-penn-plax-undergravel-aquarium-filter-for-10-gallon-tanks-two)

## 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

- • **Air-Powered Efficiency:** Less moving parts = easy maintenance & quiet operation
- • **Dual 9.5" Filter Plates:** Maximize beneficial bacteria growth & filtration surface
- • **Universal Compatibility:** Perfectly sized for 10-gallon freshwater & saltwater tanks
- • **Triple Filtration Action:** Biological, chemical, and physical filtration in one system
- • **Aerate & Filter Simultaneously:** Boost oxygen levels while keeping water crystal clear

## Overview

Penn-Plax’s Clear-Free Premium Undergravel Filter features two 9.5" plates designed for 10-gallon tanks, delivering biological, chemical, and physical filtration powered by an air pump (not included). This air-driven system not only filters but also aerates your aquarium, promoting a healthy aquatic environment with minimal maintenance. Compatible with both freshwater and saltwater setups, it’s a proven, cost-effective solution trusted by hobbyists for decades.

## Description

PENN-PLAX presents the Clear-Free Premium Under Gravel Aquarium Filter. Those who’ve been around the aquatic block for a while know that Under Gravel Filters (UGFs) are a testament of time. This 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. It’s suitable for most 10 gallon aquariums, and is safe for Freshwater and Saltwater setups.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. (Note: The under-gravel plates may be blue or black plastic)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 2 Replaceable Filt-a-Carb Activated Carbon Media CartridgesMeasurements: Each Filter Plate Separately = 9.5” (W) x 9.5” (D) Filter Plates Together = 19” (W) x 9.5” (D) Each Lift Tube at Filter Plate Base = 9.75” – 12.75”Shop PENN-PLAX for All Your Pet’s Needs: PENN-PLAX is a manufacturer and distributor of top quality pet supplies, who specialize in creating excellent pet products for animals, both great and small.

Review: Best filter for the money - An under gravel is simply one of the best filters you can buy, dollar for dollar. This is because they are highly effective, simple, inexpensive, and last a long time. Here are some tips for how to use this filter correctly. 1. DO NOT OVER CLEAN YOUR GRAVEL. This is the most important thing. You should not clean your gravel much at all. Yes some brown stuff will accumulate. This brown stuff is not "fish poop". It is beneficial bacteria. If you remove this beneficial bacteria your filter will stop working and your fish may die. DO NOT OVER CLEAN YOUR GRAVEL. If you must clean your gravel, only clean 1/2 the tank at a time and give the cleaned side some time to regrow its bacteria before cleaning the other side. Otherwise only very lightly clean the top 1/2 inch of gravel. 2. You do not really need the carbon cartridges. If you want to support Penn-Plax, I guess you could keep buying them. 3. Use 1-3 inches of 1/8 inch aquarium gravel on top of the filter. Under gravel filters are so effective because they provide a lot of surface area for beneficial bacteria to grow on. The more gravel you have the more effective this filter will be. 4. Decide whether you want to use a power head or an air pump to move water through the filter. Power heads will greatly increase the effectiveness of the filter and provide cleaner water. If you plan on having a lot of fish in your tank, you should use power heads. The power heads should be rated at a gallons per hour that is 2-3x the gallons of the tank. If you use air pumps, they should be rated for the size of your aquarium. 5. Decide whether you want to join the under gravel plates or not. If you are using air pumps I would not join the plates. Simply put an air stone in each uplift tube for each plate. You do not need to buy multiple air pumps. Just buy a simple 'T' joint to split the output from the pump. If you are using power heads, I would join every two plates and use one power head per two plates. Some people are complaining that this filter killed their fish which is very unfortunate. The filter did not kill their fish. Incorrect use of the filter killed their fish. They probably cleaned out all the gravel and removed all the beneficial bacteria which caused the filter to stop working. Unless the filter has become so clogged that the water is no longer flowing through it, there is no need to clean the gravel or underneath the filter. If this does happen, I would suggest that the person is greatly overfeeding their fish! Some people are complaining that this filter "produces high nitrate." Producing nitrate is the point of all filters and shows that a filter is functioning properly! If your nitrate levels are too high for you to manage, you are putting too much food in the tank. A different filter is not going to fix this. There are only two ways to remove nitrate from an aquarium: change the water or grow plants. Really the plants are just incorporating the nitrate into their bodies, so you will have to remove some plants eventually too if you want to actually remove the nitrate. There is a reason many successful hobbyist have used under gravel filters for decades and I am very glad that Penn-Plax makes this product!
Review: Unfiltered Testimonial - works great...exactly what I needed at a great price

## 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 10 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 (color of plates may vary), 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 = 9.5 (W) x 9.5 (D) / Filter Plates Together = 19 (W) x 9.5 (D) / Each Lift Tube at Filter Plate Base = 9.75 – 12.75

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002AQ1S8 |
| ASIN  | B0002AQ1S8 |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #9,469 in Pet Supplies ( See Top 100 in Pet Supplies ) #66 in Aquarium Filter Accessories |
| Brand Name | Penn-Plax |
| Color | Blue |
| Customer Reviews | 4.4 4.4 out of 5 stars (8,212) |
| Date First Available | January 23, 2008 |
| Date First Available  | January 23, 2008 |
| Directions | Wash with warm water before placing in aquarium. |
| Included Components | 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 |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 9.5 x 1.25 x 10.25 inches |
| Item Package Dimensions L x W x H | 9.84 x 9.45 x 1.18 inches |
| Item Weight | 0.8 Pounds |
| Item model number | CFU10 |
| Item model number  | CFU10 |
| Manufacturer | Penn Plax, INC. |
| Manufacturer  | Penn Plax, INC. |
| Model Name | CFU10 |
| Number of Items | 1 |
| Product Dimensions  | 9.5 x 1.25 x 10.25 inches; 12.8 ounces |
| Size | 10 Gallons |
| Specific Uses for Product | Indoor |
| Style | 10 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 |

## Images

![Penn-Plax Undergravel Aquarium Filter for 10 Gallon Tanks – Two 9.5” x 9.5” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks - Image 1](https://m.media-amazon.com/images/I/81fuhCHe2-L.jpg)

## Available Options

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

## Questions & Answers

**Q: What are the filters dimensions?**
A: About 19 x 9.5-inches.

**Q: Do you need a normal filter in addition to this? Or can this be the only filter you use to keep your tank clear?**
A: U can jus use this filter but it will take a long time for the biological things to get right. If u get a filter that runs water it will only take about 5 days for the ph to get right an the ammonia to clear. So it would be a good idea to get a little back filter to speed up things an keep the water even more clear.

**Q: Should the top of the plastic tubes be fully submerged, where the carbon filter is? Or should they be half in the air, half underwater?**
A: fully submerged

**Q: Is this okay to have with live plants considering significant root growth?**
A: Yeah plant it up.helps nitrate flow which fertilized plants,make momma happy, me likey

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best filter for the money
*by M***S on May 12, 2022*

An under gravel is simply one of the best filters you can buy, dollar for dollar. This is because they are highly effective, simple, inexpensive, and last a long time. Here are some tips for how to use this filter correctly. 1. DO NOT OVER CLEAN YOUR GRAVEL. This is the most important thing. You should not clean your gravel much at all. Yes some brown stuff will accumulate. This brown stuff is not "fish poop". It is beneficial bacteria. If you remove this beneficial bacteria your filter will stop working and your fish may die. DO NOT OVER CLEAN YOUR GRAVEL. If you must clean your gravel, only clean 1/2 the tank at a time and give the cleaned side some time to regrow its bacteria before cleaning the other side. Otherwise only very lightly clean the top 1/2 inch of gravel. 2. You do not really need the carbon cartridges. If you want to support Penn-Plax, I guess you could keep buying them. 3. Use 1-3 inches of 1/8 inch aquarium gravel on top of the filter. Under gravel filters are so effective because they provide a lot of surface area for beneficial bacteria to grow on. The more gravel you have the more effective this filter will be. 4. Decide whether you want to use a power head or an air pump to move water through the filter. Power heads will greatly increase the effectiveness of the filter and provide cleaner water. If you plan on having a lot of fish in your tank, you should use power heads. The power heads should be rated at a gallons per hour that is 2-3x the gallons of the tank. If you use air pumps, they should be rated for the size of your aquarium. 5. Decide whether you want to join the under gravel plates or not. If you are using air pumps I would not join the plates. Simply put an air stone in each uplift tube for each plate. You do not need to buy multiple air pumps. Just buy a simple 'T' joint to split the output from the pump. If you are using power heads, I would join every two plates and use one power head per two plates. Some people are complaining that this filter killed their fish which is very unfortunate. The filter did not kill their fish. Incorrect use of the filter killed their fish. They probably cleaned out all the gravel and removed all the beneficial bacteria which caused the filter to stop working. Unless the filter has become so clogged that the water is no longer flowing through it, there is no need to clean the gravel or underneath the filter. If this does happen, I would suggest that the person is greatly overfeeding their fish! Some people are complaining that this filter "produces high nitrate." Producing nitrate is the point of all filters and shows that a filter is functioning properly! If your nitrate levels are too high for you to manage, you are putting too much food in the tank. A different filter is not going to fix this. There are only two ways to remove nitrate from an aquarium: change the water or grow plants. Really the plants are just incorporating the nitrate into their bodies, so you will have to remove some plants eventually too if you want to actually remove the nitrate. There is a reason many successful hobbyist have used under gravel filters for decades and I am very glad that Penn-Plax makes this product!

### ⭐⭐⭐⭐⭐ Unfiltered Testimonial
*by B***I on February 9, 2026*

works great...exactly what I needed at a great price

### ⭐⭐⭐⭐ A bit noisy
*by H***M on August 11, 2025*

Not sure I would recommend this for an open rimless tank, might be ok with a tank that has a complete lid reason being it takes at least a 30-60gal. rated air pump to run all four air bubblers & then the bubbles coming out the top are constantly popping & its quite loud. Might not be an issue if the tank lid muffled the noise. I think if I run two small air pumps - one for each side running two air stones it might cut down on the noise level since the force of air will be reduced so less bubble force. Other than that product seems good quality.

## Frequently Bought Together

- Penn-Plax Undergravel Aquarium Filter for 10 Gallon Tanks – Two 9.5” x 9.5” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks
- PULACO Dual Outlet Aquarium Air Pump, Quiet Oxygen Pump with Accessories for 10 to 100 Gallon
- Aquarium Air Pump Accessories - Contains Airline Tubing, Control Valve, Air Stones, Connectors, Check Valves, Suction Cups

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-03-04*