Penn-Plax Replacement Filter Media for Cascade 300 GPH Hang-on Filter, 3 Pack, 10x3x7in
Penn-Plax Replacement Filter Media for Cascade 300 GPH Hang-on Filter, 3 Pack, 10x3x7in
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Penn-Plax Replacement Filter Media for Cascade 300 GPH Hang-on Filter, 3 Pack, 10x3x7in

Where Penn-Plax Replacement Filter Media for Cascade... fits in your dog's day
Three short notes on who this product suits, how owners use it and what they keep an eye on, with your vet as the person to ask about health questions.
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1Who it's for
Owners who want everyday gear that fits their dog's size and makes walks, meals and rest at home simpler to manage.
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2How to use it
Compare the size or capacity details with your dog's measurements.
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3What owners notice
Owners look at how the item fits into the daily routine and how well it holds up after several weeks of regular use on walks, at meals and at home.
About this product
This replacement filter media is a preassembled cartridge measuring roughly 10 x 3 x 7 inches, and the pack holds three of them. Each cartridge goes into the tray of a Cascade 300 GPH hang-on power filter, model CPF5, and seats there without gaps. The cartridges suit freshwater and marine aquariums and carry activated carbon behind a poly-fiber floss barrier.
Cartridge construction and what the carbon and floss layers are for
The cartridge holds activated carbon and a poly-fiber floss barrier in one preassembled unit. Because the unit arrives assembled, a change means lifting the old cartridge out of the tray and setting the new one in, with no loose media to portion. Cartridges come in black or blue.
Penn-Plax gives a working life of 6 to 12 weeks under normal conditions, so one 3-pack covers three changes at that interval.
| Brand | Penn-Plax |
|---|---|
| Model | CPF5 |
| Dimensions | 10 x 3 x 7 inches |
| Pack count | 3 |
Does it fit your Cascade 300 GPH filter?
The cartridge is made for the Cascade 300 GPH hang-on power filter, specifically model CPF5, and drops into that filter's tray without gaps. Check the model number on your filter before buying: a Cascade filter of a different flow rating is not covered by this fit. The cartridges work in freshwater and marine aquariums.
Cartridge colour options
Cartridges are supplied in black or blue, and either colour is the same 10 x 3 x 7 inch preassembled unit for the Cascade 300 GPH filter.
How many cartridges come in the pack?
How many cartridges are in one pack?
One pack contains three cartridges, which matches the 6 to 12 week replacement interval across three changes.
What size is a single cartridge?
Each cartridge measures approximately 10 x 3 x 7 inches.
Which filter model does this cartridge fit?
It fits the Cascade 300 GPH hang-on power filter, model CPF5.
Can I use these cartridges in a marine tank?
Yes. Penn-Plax lists the cartridges for freshwater and marine aquariums.
What the 3-pack contains
- Three preassembled filter cartridges for the Cascade 300 GPH hang-on power filter
- Each cartridge holds activated carbon and a poly-fiber floss barrier
- Cartridges in black or blue
Product details
| Brand | Penn-Plax |
|---|---|
| Product type | Aquarium Filter Media |
| Department | Penn-Plax Canada |
| Sold by | DogJointly, operated by YALEO LLC |
| Delivery | Free standard US delivery, usually 7 to 14 business days after 1 to 3 days to prepare |
| Returns | 30 days on unopened items in their original packaging, with damaged or wrong items covered at our cost |
Delivery and tracking
Standard delivery is free to every US address, we prepare orders in 1 to 3 business days, delivery usually takes 7 to 14 business days, and the tracking link arrives by email when the parcel ships.
Returns and refunds
You can return unopened items in their original packaging within 30 days of delivery. Damaged, faulty or wrong items are replaced or refunded at our cost, so please read the refund policy and contact us before you send anything back.
How Subscribe and Save works
Choose the subscription option above the cart button to receive this product on a regular schedule at the lower subscription price. You can skip a delivery, change the schedule or cancel from your account or by writing to support@dogjointly.com.
Multi-buy savings
Pick 2, 3 or 4 units in the quantity cards to save 10, 15 or 25 percent on the item price. The saving is shown in the cart before checkout, so you can compare the total with a single unit.
Labels, ingredients and your vet
Ingredient lists and serving tables can change between batches, so the label on the pack you receive is the reference to follow. Please ask your vet before starting a supplement, especially for a senior dog or a dog on medication.
Questions about this product
Is Penn-Plax Replacement Filter Media for Cascade 300 GPH Hang-on Filter, 3 Pack, 10x3x7in available in the United States?
Yes, it is in stock at DogJointly and ships free to US addresses, usually within 7 to 14 business days after 1 to 3 days to prepare.
How should I compare Penn-Plax Replacement Filter Media for Cascade... with similar products?
Compare the brand, format, serving table and pack size in the details above with similar items in Penn-Plax Canada, and check the choice with your vet.
Where can I find delivery and returns information?
Delivery and returns are summarised on this page and set out in full in the shipping and refund policies linked in the footer of every page.
Guides and order help
Reading that helps you compare products, plus the pages that answer delivery and return questions.










