30PCS #3 Fish Tank Filters Compatible with Rite-Size C - Reliable

Our review of these 30PCS #3 fish tank filters finds them best for hobbyists and aquarium owners who need an affordable, bulk supply of replacement cartridges for medium to large power filters. The single biggest reason to buy is straightforward: they provide a simple way to keep filtration working on 20-60 gallon tanks without hunting for OEM parts. In practice the cartridges fit common #3 and Rite-Size C filter housings, trap visible debris, and reduce discoloration so tanks stay clear between routine changes.

Key Features

• #3 Size Compatibility: Sized to fit EZ-Change #3 and Rite-Size C housings so replacements slide in without trimming.
• Works for Multiple Tank Sizes: Designed for 20-40 gallon and 30-60 gallon setups, covering a wide range of home aquariums.
• Dual-Layer Filtration: Thickened cotton and activated carbon combine to remove particles and help reduce odors and discoloration.
• Bulk Pack Convenience: Thirty cartridges in one pack mean fewer trips to reorder and predictable replacement every 2-4 weeks.
• Simple Swap-Out: Cartridges are easy to change in Penguin PRO style power filters and similar units without special tools.

Who It's For

The pack is ideal for aquarium owners who run medium to large filters and want an economical long-term supply of replacements, particularly those using EZ-Change #3 or Rite-Size C compatible motors such as Penguin PRO series models. It suits people who prefer scheduled maintenance and buy in bulk to avoid running out mid-cycle.

Those who should look elsewhere are owners who need heavy-duty carbon content for chemical filtration or who need ultra-durable cartridges that stay clean much longer; several users note the charcoal content is modest and cartridges can get dirty quickly, so high-demand setups or sensitive systems may require premium media or more frequent changes.

Pros & Cons

Pros

• Good value for money when buying replacements in large quantities for routine maintenance.
• Fits a wide range of #3 and Rite-Size C housings for easy compatibility with common power filters.
• Combination of cotton and activated carbon improves water clarity and removes mild odors and discoloration.
• Simple to install, making routine changes quick and repeatable.

Cons

• Charcoal content is limited according to several customer reports, so chemical filtration is modest.
• Some users find durability limited and may need to replace cartridges more often than expected in dirty tanks.

Specifications

Brand	MyfatBOSS
Pack Quantity	30 PCS
Compatible Size	#3 (Rite-Size C / EZ-Change #3)
Fits Tank Capacity	20-40 gal, 30-60 gal, 50 gal, 55-60 gal
Materials	Thickened cotton and activated carbon
Approximate Dimensions	5.3 in x 5.7 in x 6 in
Suggested Change Interval	Every 2-4 weeks

Our Verdict

These 30PCS #3 filter cartridges are a practical, cost-effective option for routine replacements on medium and large home aquariums using #3 or Rite-Size C housings. They deliver reliable mechanical filtration and some chemical adsorption at a low per-cartridge cost, making them a smart choice for budget-conscious hobbyists who perform regular maintenance, while users seeking stronger charcoal performance should consider specialty cartridges.

Frequently Asked Questions

Will these fit my Penguin PRO filter?
Yes, they are compatible with Rite-Size C and fit Penguin PRO style filters listed for size #3.

How often should I replace the cartridges?
Replace every 2-4 weeks depending on bioload and water clarity; heavy loads may need more frequent changes.

Do these remove odors and discoloration?
The activated carbon helps reduce mild odors and discoloration, but charcoal content is modest so very strong chemical contamination may need a higher grade carbon media.