Description
Product Overview
The Penn Plax Clear-Free Premium Under Gravel Filter is an air-driven filtration system designed to maintain crystal clear water in your aquarium. It utilizes an air pump (not included) to draw water through gravel and filter plates, providing comprehensive biological, chemical, and physical filtration. Each filter plate measures 11.25 inches wide by 11.25 inches deep, with a combined coverage of 45 inches by 11.25 inches when connected. The kit includes four filter plates, four adjustable lift tubes (ranging from 13.25 to 16.5 inches), four straight airline tubes, nine filter plate connectors, and four replaceable Filt-a-Carb activated carbon media cartridges. With dimensions of 11.5 x 2.5 x 11.5 inches and a weight of 2.02 pounds, this filter is built for durability and efficient performance in various tank sizes.

Usage
This under gravel filter is ideal for freshwater aquariums ranging from 10 to 55 gallons, making it suitable for home aquariums, office tanks, and educational settings. It is perfect for hobbyists seeking reliable filtration without compromising tank aesthetics. The air-driven operation ensures gentle water circulation, reducing stress for fish while maintaining water clarity. Target audiences include beginner and intermediate aquarium owners who value ease of installation and consistent performance.
Why Choose Us
Penn Plax has been a trusted name in pet supplies since 1969, known for innovative and reliable products. The Clear-Free Premium Under Gravel Filter stands out due to its triple-action filtration, combining biological, chemical, and physical processes to eliminate impurities and odors. The inclusion of activated carbon media enhances water purity, while the adjustable lift tubes allow customization for different gravel depths. Manufactured with high-quality materials, this filter ensures long-lasting use and is backed by positive customer reviews, reflecting its effectiveness and value.
Key Features
- Air-driven system for efficient water circulation and aeration
- Triple-action filtration: biological, chemical, and physical
- Includes four filter plates and adjustable lift tubes for flexible setup
- Replaceable Filt-a-Carb activated carbon media for odor and impurity removal
- Easy installation with connectors and straight airline tubes
FAQ
What size aquarium is this filter suitable for?
The filter is available in multiple sizes to fit aquariums from 10 to 55 gallons, ensuring compatibility with a wide range of tank setups.
Does the filter include an air pump?
No, an air pump is not included and must be purchased separately to operate the filter effectively.
How often should the carbon media be replaced?
It is recommended to replace the Filt-a-Carb activated carbon media every 4-6 weeks, depending on tank bioload and water conditions.
Can this filter be used in saltwater aquariums?
This filter is designed for freshwater aquariums; using it in saltwater may reduce efficiency and longevity due to corrosion risks.
Is the filter easy to clean?
Yes, the filter plates and lift tubes can be easily removed for cleaning during routine water changes, ensuring minimal maintenance effort.




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