Heavy Duty Odor Block Advanced Scented Cat Litter
Advanced formulation with more Ammonia Block Technology* for powerful odor control.
Meet your heavyweight odor-fighting champion. Fresh Step Heavy Duty Odor Block Advanced Scented Cat Litter offers 3x odor-fighting carbon with Ammonia Block Technology,* which fights odor 3x as long† as the leading clumping litter brand. It’s the longest-lasting odor control from Fresh Step,‡ and the only litter brand backed by the power of Febreze. This proprietary litter blend is an Advanced formulation with more Ammonia Block Technology* for powerful odor control that lasts 30 days. Made with natural clay enhanced with odor-fighting power, this low-dust formula helps ensure clean surfaces and a pleasant experience for both you and your cat. This clay litter forms strong clumps for easy cleanouts. Strong enough for multi-cat households, one box of this clay clumping cat litter lasts about one month per cat based on average purchase cycles.
Available Sizes: 2 pack of 17.5 Lbs
* vs. Fresh Step Heavy Duty Odor Block.
** vs. Fresh Step Odor Shield.
† On fecal malodor.
‡ Among Fresh Step clumping litters.
§ Original receipt/UPC required, submit refund request within 60 days of purchase. Full terms and instructions: Fresh Step website/FAQs.
Highlights
3X Odor-Eliminating Carbon*
30-Day Odor Control Guaranteed§
Fights Ammonia Odors Before They Start
Cat-Approved Fragrance
Heavy Duty Litter
Get 3x odor-fighting carbon with Ammonia Block Technology* in this heavy duty cat litter, which fights odor 3x longer† than the leading clumping litter brand.
High-Quality Clumping
This clumping cat litter is made with high-quality clay for strong clumps and easy cleanup, all in a low-dust formula that makes for a pleasant experience for you and your cat.
Advanced Formulation
This proprietary litter blend features an Advanced formulation with more Ammonia Block Technology* for powerful odor control.
Paw-Activated Freshness
Smart, science-backed innovations like paw-activated freshness deliver a proactive, superior litter experience that works the moment your cat steps in.
Multi-Cat Formula
Strong enough even for multi-cat households, this Fresh Step Heavy Duty Odor Block Advanced Scented Cat Litter delivers 30 days of odor control.
1 Fill
Fill your clean litter box with 3–4 inches of Fresh Step litter. Pour litter no more than a few inches from the box OR keep the carton close to the box when pouring litter.
2 Remove
Litter quickly forms a clump around liquid waste. Remove clumps and solids daily, and dispose of in trash. Do not flush.
3 Add
Add more Fresh Step clumping cat litter to refresh your litter box. Maintain level of litter at 3–4 inches.
Tough on odors. Easy on you.
Even your cat’s impressed: Fresh Step litter brings you the latest in odor control technology.
Cat Care
Everything you wanted to know about Felis catus (that's Latin for kitty).
Product FAQs
Fresh Step™ Heavy Duty Odor Block ADVANCED is our strongest odor-fighting formula yet, featuring 3X odor-eliminating carbon* and advanced Ammonia Block Technology. It’s designed for multi-cat homes and delivers the longest-lasting freshness in the Fresh Step lineup — so your litter box stays cleaner and your home smells great.
* vs. Fresh Step Odor Shield.
Enjoy up to 30 days of guaranteed odor control, even in busy multi-cat households. This advanced formula works around the clock to neutralize tough odors, giving you peace of mind and a fresher home.
Ammonia Block Technology neutralizes strong ammonia odors before they start, helping your litter box stay fresh longer. It’s a science-backed innovation that works every time your cat steps in.
Absolutely! Our ClumpLock™ technology quickly absorbs moisture and locks in odors, forming tight clumps that are easy to scoop. No sticky residue or crumbling clumps — just quick cleanup and less mess.
Yes! This litter is specially formulated for multi-cat households, delivering powerful odor control and superior absorbency to handle even the busiest litter boxes.
The ADVANCED formula includes more Ammonia Block Technology and 3X odor-eliminating carbon,* delivering longer-lasting freshness and tighter clumps compared to older formulas.
* vs. Fresh Step Heavy Duty.
Yes! Its superior absorbency means you’ll need to change the litter box less often, making life easier for busy cat parents.
Yes. Fresh Step™ Heavy Duty Odor Block ADVANCED works with most automated litter boxes. To confirm compatibility please contact your automated litter box manufacturer before use.
Yes, it features Febreze Freshness — a light, clean scent that’s pleasant but never overpowering. The fragrance is designed to keep your home smelling fresh while keeping your kitty comfortable.
Definitely! The low-dust formula helps keep your home clean and your cat’s paws comfortable, reducing mess around the litter box.
Every time your cat steps into the box, paw-activated freshness releases a burst of odor-fighting power. It’s a smart, science-backed way to keep things fresh with every use.
Yes! The packaging is designed for convenience, making it easy to pour, store, and handle — even for busy cat parents.
As with all cat litters, wash your hands thoroughly after handling used litter. Cat feces can transmit toxoplasmosis, so extra care is recommended for pregnant women and immunosuppressed persons.
Fresh Step™ Heavy Duty Odor Block ADVANCED is the latest evolution of the Heavy Duty Odor Block line, featuring enhanced technology and improved performance. If you’re switching from a previous version, you’ll notice better odor control and longer-lasting freshness.
For cat parents who want a little extra help fighting litter box odors, choose Heavy Duty Odor Block ADVANCED for superior odor control, easy maintenance, and a cleaner, happier home. It’s trusted by cat lovers and designed to keep both you and your kitty smiling.