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

Thanks for your question. Yes, these filters are designed for the Cascade 300.

I bought a nine pack and only received three. Can anyone help?

They come in 3-packs. I've never seen a nine pack.

I have a 65 gallon aquarium for 2 sliders. How often should I change this filter?

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.

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.

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.

Penn Plax Cascade 300 Gph Hang On Filter Replacement Media

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Description

💧 Elevate your aquarium game—because your fish deserve the freshest splash!

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.

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.

Specifications

ASIN	B0002DJCGS
ASIN	B0002DJCGS
Age Range Description	All Life Stages
Best Sellers Rank	#15,734 in Pet Supplies ( See Top 100 in Pet Supplies ) #113 in Aquarium Filter Accessories
Brand Name	Penn-Plax
Color	No Color
Customer Reviews	4.6 4.6 out of 5 stars (3,579)
Date First Available	May 5, 2011
Date First Available	May 5, 2011
Department	Unisex-Adult
Department	Unisex-Adult
Directions	rinse with clean water before placing in filter
Included Components	3 Filter Media Replacements
Item Dimensions LxWxH	10 x 3 x 7 inches
Item Package Dimensions L x W x H	10 x 8.19 x 2.6 inches
Item Weight	2 pounds
Item model number	CPF5C3
Item model number	CPF5C3
Manufacturer	Penn Plax
Manufacturer	Penn Plax
Material	Plastic
Model Name	CPF5C3
Number of Items	1
Product Dimensions	10 x 3 x 7 inches; 2 pounds
Size	Cascade 300 filter (3pack)
Specific Uses for Product	Indoor
Target Audience Keyword	algae-eaters, betta-fish, bottom-feeder-fish, cichlid-fish, fish, goldfish, invertebrate-fish, mollusks, octopuses, rays, sharks, snails
Warranty Description	Amazon policy

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