--- product_id: 6721075 title: "Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in" price: "NZ$77" currency: NZD in_stock: true reviews_count: 13 url: https://www.desertcart.nz/products/6721075-penn-plax-cascade-300-gph-hang-on-filter-replacement-media store_origin: NZ region: New Zealand --- # 300 GPH flow rate Dual-sided activated carbon & poly-fiber floss Lasts 6-12 weeks per cartridge Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in **Price:** NZ$77 **Availability:** ✅ In Stock ## Summary > 💧 Elevate your aquarium game—because your fish deserve the freshest splash! ## Quick Answers - **What is this?** Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in - **How much does it cost?** NZ$77 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/6721075-penn-plax-cascade-300-gph-hang-on-filter-replacement-media) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Swap & Go:** Preassembled cartridges slide in cleanly—no mess, no fuss, just pure filtration power. - • **Crystal-Clear Water, Fast:** Dual-action filtration removes odors, discoloration, and debris for sparkling tanks. - • **Precision Fit, Zero Bypass:** Custom-sized for Cascade 300 GPH filters to ensure consistent flow and debris capture. - • **Universal Fresh & Saltwater Fit:** Engineered for both freshwater and marine aquariums to maintain balanced aquatic habitats. - • **Trusted Legacy, Proven Performance:** Backed by 60+ years of Penn-Plax innovation for dependable, long-lasting aquarium care. ## Overview The Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media 3-pack features dual-sided cartridges combining activated carbon and poly-fiber floss to efficiently remove toxins, odors, and debris. Designed specifically for Cascade 300 GPH filters, each cartridge ensures a perfect fit and consistent water flow, lasting 6 to 12 weeks. Suitable for both freshwater and saltwater tanks, these easy-to-install cartridges maintain a healthy aquatic environment with minimal upkeep, backed by Penn-Plax’s 60+ years of trusted pet care innovation. ## Description The Penn Plax Cascade 300 GPH Filter Cartridges with Activated Carbon will improve the quality of your aquarium water and keep your fish healthy. This replacement filter is designed to fit your Cascade 300 GPH hang-on power filter and will last 6 to 12 weeks under normal conditions. Activated carbon is great for freshwater aquarium filtration. It has the ability to not only visually clear the water, but trap pollutants in the pores of the carbon so they do not enter the water. This filter cartridge will remove ammonia, nitrites, odors and other harmful toxins from your aquarium to keep it healthy. It has a poly-fiber floss barrier which screens out particulate matter and debris for an extra layer of protection. Within 24 hours you will see a drastic difference in the water quality. Each filter cartridge is perfectly measured to fit into the Cascade 300 Hang on Filter tray without any gaps preventing debris and contaminants from entering back into the water. This filter cartridge is suitable for both freshwater and marine environments. When used together, the Cascade 300 GPH Filter Model CPF5 and Cascade 300 filter cartridges provide maximum protection against water pollutants from harming your fish. Sold in 3 pack. Review: Effective and affordable. - I love these filters. They work perfectly for my 5 and 10 gallon fish tanks. The filters are have a slim design and easily slide into my water filtration system. I just remove the old filter and soak a new one in the tank until it is completely saturated. Then simply slide into your filter. They are that easy to use. No mess to clean up. The filters are very quiet and I have mine in the filtration system for about a month. If for some reason the filter needs changing before that I can hear the water running through the filter and I know it’s time to replace it. These are very durable and dependable filters. I’ve had problems ordering from other companies that change designs without advance warning. I really love my fish and want to provide the best possible high quality environment for them. These filters have consistently been the same every time I order them and they arrive quickly. I think they are extremely affordable and do excellent in a heated tank. I have fresh water tanks that stay around 78 degrees. These work very well and keep everything clean. Review: Nice filter for a large aquarium - Filter was easy to set up and works well. Price was a plus, as well. ## Features - Sparkling Water Made Simple - Dual-action aquarium filter cartridge designed for Cascade 300 GPH hang-on filters. Activated carbon removes discoloration and odors while the poly-fiber layer traps particles - keeping your fish tank water clean and clear. - Healthier Habitat for Fish - These filter cartridges provide efficient filtration for both freshwater and marine aquariums, helping maintain a balanced and stable aquatic environment. - Easy Upkeep, Every Time - Each filter cartridge typically lasts up to 6-12 weeks depending on tank conditions. The preassembled design allows quick, clean replacement with no messy setup-simply slide the cartridge into the filter compartment for effective filtration. - Compact Fit, Consistent Flow - Perfectly measured to fit Cascade 300 model (CPF5), these black or blue filter cartridges prevent debris bypass. Dimensions: approximately 10 x 3 x 7 inches. Sold in a convenient 3-pack for easy replacement. - Penn-Plax Legacy - With over 60 years of innovation, Penn-Plax creates expertly crafted, dependable pet products designed to enrich habitats, inspire creativity, and promote the health and happiness of pets everywhere ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.6 out of 5 stars 3,582 Reviews | ## Images ![Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in - Image 1](https://m.media-amazon.com/images/I/81fMK3hjiyL.jpg) ![Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in - Image 2](https://m.media-amazon.com/images/I/812qbN2ZbkL.jpg) ![Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in - Image 3](https://m.media-amazon.com/images/I/91m8-dduS4L.jpg) ![Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in - Image 4](https://m.media-amazon.com/images/I/71-SFzoE5sL.jpg) ![Penn-Plax Cascade 300 GPH Hang On Filter Replacement Media, 3 Pack - Dual-Sided Aquarium Filter Cartridge with Activated Carbon & Poly-Fiber Floss for CPF5 -Fresh & Saltwater - Blue & Black, ‎10x3x7in - Image 5](https://m.media-amazon.com/images/I/81ze5KzNv8L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Will this fit the cascade 300 hang on filter? here is the link https://www.amazon.com/gp/product/b0002dj82g/ref=crt_ewc_img_dp_2?ie=utf8&psc=1&smid=a2** A: Thanks for your question. Yes, these filters are designed for the Cascade 300. **Q: I bought a nine pack and only received three. Can anyone help?** A: They come in 3-packs. I've never seen a nine pack. **Q: I have a 65 gallon aquarium for 2 sliders. How often should I change this filter?** A: Hey Wendytime, Thanks for your question. As a general rule, we recommend you that you change the filter cartridges every 6-8 weeks. However, sliders generate more waste than fish and as a result, you should change the media more often. Your tank conditions will dictate how often they should be changed, but figure around every 3-4 weeks. **Q: How do i know when the filters are spent? I had an algae bloom and changed mine out probably too quickly to try control it.** A: I rinse mine and use them until they begin to fall apart. But I also keep a new set in case of RIP or tear. I love these filters. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Effective and affordable. *by I***? on January 18, 2026* I love these filters. They work perfectly for my 5 and 10 gallon fish tanks. The filters are have a slim design and easily slide into my water filtration system. I just remove the old filter and soak a new one in the tank until it is completely saturated. Then simply slide into your filter. They are that easy to use. No mess to clean up. The filters are very quiet and I have mine in the filtration system for about a month. If for some reason the filter needs changing before that I can hear the water running through the filter and I know it’s time to replace it. These are very durable and dependable filters. I’ve had problems ordering from other companies that change designs without advance warning. I really love my fish and want to provide the best possible high quality environment for them. These filters have consistently been the same every time I order them and they arrive quickly. I think they are extremely affordable and do excellent in a heated tank. I have fresh water tanks that stay around 78 degrees. These work very well and keep everything clean. ### ⭐⭐⭐⭐⭐ Nice filter for a large aquarium *by A***N on March 2, 2026* Filter was easy to set up and works well. Price was a plus, as well. ### ⭐⭐⭐⭐⭐ For the Cascade we have. *by K***I on April 14, 2026* Works great as expected. Water is crystal clear and fish thriving. Have these on reorder. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.nz/products/6721075-penn-plax-cascade-300-gph-hang-on-filter-replacement-media](https://www.desertcart.nz/products/6721075-penn-plax-cascade-300-gph-hang-on-filter-replacement-media) --- *Product available on Desertcart New Zealand* *Store origin: NZ* *Last updated: 2026-08-21*