The information provided consistently identifies the product as a Hikari Bacto-Surge Foam Filter, specifically the extra-large size designed for aquariums up to 125 gallons. Here's the product description: Enhance your aquarium's filtration with the Hikari Bacto-Surge Foam Filter. This extra-large sponge filter is designed to provide exceptional mechanical and biological filtration for tanks up to 125 gallons. Crafted with the highest quality foam sponge, the Bacto-Surge filter promotes a healthy aquarium environment by encouraging the growth of beneficial bacteria. The filter's extreme foam density allows for great surface area, maximizing the colonization of these beneficial bacteria, which are crucial for breaking down harmful waste and maintaining water quality. This durable sponge filter is ideal for nano tanks, fry tanks, and aquariums housing sensitive fish like discus. The Bacto-Surge provides both mechanical and biological filtration, ensuring your aquarium water is clear and healthy. Key Features: * Provides mechanical and biological filtration * Suitable for aquariums up to 125 gallons * Encourages the growth of beneficial bacteria * High-quality foam sponge for effective filtration * Ideal for nano, fry and sensitive discus tanks * Extra-large size for maximum filtration capacity * Durable construction