Penn-Plax Cascade 300 Power Filter – Hang-On, 300 GPH for Tanks Up to 100 Gallons

The Cascade 300 Power Hang-On Filter from Penn-Plax delivers quiet, reliable filtration for both freshwater and saltwater tanks. With a capable 300 gallons-per-hour flow, it supports aquariums up to 100 gallons and helps maintain clear water and healthy conditions without dominating the decor.

Smart filtration design for versatile tanks

Designed to tackle mechanical, chemical, and biological filtration in one compact unit, the Cascade 300 uses disposable double‑sided media cartridges containing activated carbon and poly fiber floss. These elements work together to trap floating debris, reduce discoloration, and soften odors, helping your aquarium water look and feel cleaner.

• Traps debris and reduces discoloration for visibly clearer water
• Activated carbon targets chemicals and odors, improving water quality
• Fine floss layer adds an extra mechanical filtration step

In addition, a dedicated bio sponge cartridge supports the growth of beneficial bacteria, contributing to steady biological filtration separate from the first stage media. The Bio-Falls system adds oxygenation and aids with the management of ammonia and nitrate levels, contributing to a more balanced overall environment.

Practical design and everyday use

The Cascade 300 is a hang-on style filter with an adjustable flow knob, letting you tailor water movement for feeding times or tank conditions. The lift tube can extend from 8.25 inches to 12.25 inches to accommodate a range of aquarium heights. Do keep in mind that some operational noise is typical for hanging filters.

• Easy, secure mounting on the tank rim
• Flow can be increased or decreased as needed
• Suitable for both freshwater and saltwater setups

Key specifications include compact overall dimensions of 8.25 inches high, 11.25 inches wide, and 6.25 inches deep, making it a practical choice for mid to larger tanks where space matters. For ongoing performance, plan to replace the disposable cartridges about once a month to maintain filtration effectiveness and water clarity.