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A box of Fresh Step Heavy Duty cat litter and a new box of the same litter showing how the litter packaging has changedA box of Fresh Step Heavy Duty cat litter and a new box of the same litter showing how the litter packaging has changed
A box of Fresh Step Heavy Duty cat litter on a gray backgroundA box of Fresh Step Heavy Duty cat litter on a gray background
Heavy Duty hero
2 cats with their arms raised, the words "Even your cat's impressed" to describe the 30 days guarantee and 3x odor-eliminating carbon2 cats with their arms raised, the words "Even your cat's impressed" to describe the 30 days guarantee and 3x odor-eliminating carbon
Clumps stronger than corn-based litter. Two scoopers showing the compact scooping of Fresh Step vs the leading competitorClumps stronger than corn-based litter. Two scoopers showing the compact scooping of Fresh Step vs the leading competitor
A cat scratching at cat litter and the words "Paw-activated odor control"A cat scratching at cat litter and the words "Paw-activated odor control"
A comparison chart of Fresh Step litters, the odor-fighting guarantees and special featuresA comparison chart of Fresh Step litters, the odor-fighting guarantees and special features
A woman playing with her cat. A pink panel on the right side with claims: 3x odor-eliminating carbon, fights ammonia odors, low dustA woman playing with her cat. A pink panel on the right side with claims: 3x odor-eliminating carbon, fights ammonia odors, low dust
A close up of the bits that make up Fresh Step cat litter: ammonia blockers, naturally strong clay, odor-eliminating carbonA close up of the bits that make up Fresh Step cat litter: ammonia blockers, naturally strong clay, odor-eliminating carbon
Two cats looking at their owner as litter is poured into a litter box. Instructions for how to use in 3 steps below.Two cats looking at their owner as litter is poured into a litter box. Instructions for how to use in 3 steps below.
A woman snuggling her cat. The review above says "It has been a nose saver! I no long have to clean the litter box 2–3 times a day."A woman snuggling her cat. The review above says "It has been a nose saver! I no long have to clean the litter box 2–3 times a day."
A box of Fresh Step Heavy Duty cat litter and a new box of the same litter showing how the litter packaging has changedA box of Fresh Step Heavy Duty cat litter and a new box of the same litter showing how the litter packaging has changed
A box of Fresh Step Heavy Duty cat litter on a gray backgroundA box of Fresh Step Heavy Duty cat litter on a gray background
A cat standing on a cabinet with Heavy Duty cat litter beside itA cat standing on a cabinet with Heavy Duty cat litter beside it
2 cats with their arms raised, the words "Even your cat's impressed" to describe the 30 days guarantee and 3x odor-eliminating carbon2 cats with their arms raised, the words "Even your cat's impressed" to describe the 30 days guarantee and 3x odor-eliminating carbon
Clumps stronger than corn-based litter. Two scoopers showing the compact scooping of Fresh Step vs the leading competitorClumps stronger than corn-based litter. Two scoopers showing the compact scooping of Fresh Step vs the leading competitor
A cat scratching at cat litter and the words "Paw-activated odor control"A cat scratching at cat litter and the words "Paw-activated odor control"
A comparison chart of Fresh Step litters, the odor-fighting guarantees and special featuresA comparison chart of Fresh Step litters, the odor-fighting guarantees and special features
A woman playing with her cat. A pink panel on the right side with claims: 3x odor-eliminating carbon, fights ammonia odors, low dustA woman playing with her cat. A pink panel on the right side with claims: 3x odor-eliminating carbon, fights ammonia odors, low dust
A close up of the bits that make up Fresh Step cat litter: ammonia blockers, naturally strong clay, odor-eliminating carbonA close up of the bits that make up Fresh Step cat litter: ammonia blockers, naturally strong clay, odor-eliminating carbon
Two cats looking at their owner as litter is poured into a litter box. Instructions for how to use in 3 steps below.Two cats looking at their owner as litter is poured into a litter box. Instructions for how to use in 3 steps below.
A woman snuggling her cat. The review above says "It has been a nose saver! I no long have to clean the litter box 2–3 times a day."A woman snuggling her cat. The review above says "It has been a nose saver! I no long have to clean the litter box 2–3 times a day."
FRESH STEP™

Heavy Duty Odor Block Scented Cat Litter

3x odor-fighting carbon with Ammonia Block Technology.*

Meet your heavyweight odor-fighting champion. Fresh Step Heavy Duty Odor Block Scented Cat Litter offers 3x odor fighting carbon with Ammonia Block Technology,* which fights odor 3x as long† as the leading clumping litter brand. The longest lasting odor control from Fresh Step,‡ and the only litter brand backed by the power of Febreze, this litter helps keep your litter box smelling fresh for 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: 22 Lbs, 38 Lbs, 42 Lbs

* vs. Fresh Step Odor Shield.
† On fecal malodor.

Highlights

3X Odor Eliminating Carbon

3X Odor-Eliminating Carbon*

30 day odor control guaranteed

30-Day Odor Control Guaranteed§

Fights ammonia odors before they start

Fights Ammonia Odors Before They Start

Cat's paw with flowers representing cat-approved fragrance

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.

With Odor-Eliminating Carbon

Fresh Step litter combines naturally strong clay with carbon, Ammonia Block Technology and Febreze freshness.

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.

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 Scented Cat Litter delivers 30 days of odor control.

Cat watching its person fill a box with litter

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.

A woman removing clumps of litter from a litter box while two cats look on

2 Remove

Litter quickly forms a clump around liquid waste. Remove clumps and solids daily, and dispose of in trash. Do not flush.

A cat paw scratching litter

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.

Compare your odor fighter 🐈

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Fresh Step Heavy Duty cat litter

Fresh Step™

Heavy Duty Odor Block

main feature

3X Odor-Eliminating Carbon*

odor control

30-Day Odor Control Guaranteed§

third feature

Fights Ammonia Odors Before They Start

A box of Fresh Step Ever Fresh cat litter

Fresh Step™

Ever Fresh

main feature

Ultra-Absorbent Microgranules Help Reduce Changeouts

odor control

21-Day Odor Control Guaranteed‡

third feature

Tight, Surface-Level Clumps

Fresh Step Clean Paws cat litter for multipile cats

Fresh Step™

Clean Paws

main feature

Less Mess with Low Dust and Low Tracking

odor control

21-Day Odor Control Guaranteed‡

third feature

Larger Particles Designed to Stick Less to Cat Paws and Stay in the Box*

Fresh Step Extreme Clump cat litter

Fresh Step™

Extreme Clump

main feature

Tight Clumps

odor control

15-Day Odor Control Guaranteed†

third feature

Low-Dust Formula

A box of Fresh Step Simply Unscented cat litte

Fresh Step™

Simply Unscented

main feature

Prevents Bacterial Odor Growth on the Litter

odor control

15-Day Odor Control Guaranteed†

third feature

Low-Dust Formula

view all products

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Product FAQs

Fresh Step™ Heavy Duty Odor Block is our strongest odor-fighting formula yet, designed for multi-cat households. It delivers 30 days of odor control with 3X odor-eliminating carbon,* Ammonia Block Technology, and Febreze freshness.

*vs. Fresh Step Odor Shield

This litter combines 3X odor-eliminating carbon* with Ammonia Block Technology to neutralize tough odors on contact. It’s engineered for round-the-clock freshness for up to 30 days.

*vs. Fresh Step Odor Shield

It provides 30 days of guaranteed odor control, making it ideal for multi-cat homes and busy households.

It’s our longest-lasting odor control formula, featuring 3X odor-eliminating carbon* and paw-activated Febreze freshness for superior performance.

*vs. Fresh Step Odor Shield

Yes. It’s enhanced with Febreze freshness, providing a clean, pleasant scent that’s safe for cats and helps keep your home smelling fresh.

Absolutely. This formula is strong enough for multi-cat homes, offering powerful odor control and tight clumps for easy scooping.

Fill your litter box with 3–4 inches of litter. Scoop clumps and solids daily, and dispose of in the trash. Do not flush. Add fresh litter as needed to maintain the proper level.

Yes, Heavy Duty Odor Block is compatible with most automated litter boxes. To confirm compatibility please contact your automated litter box manufacturer before use.

It’s available in 22 lb and 38 lb cartons, designed to last about one month per cat based on average usage.

• 3X odor-eliminating carbon vs. Fresh Step Odor Shield
• 30-day odor control guarantee
• Ammonia Block Technology
• Paw-activated Febreze freshness
• Strong clumps for easy scooping
• Low-dust formula for cleaner surfaces

Every time your cat steps into the litter box, paw-activated technology releases a burst of Febreze freshness, helping maintain a clean-smelling environment.

Yes! It uses Ammonia Block Technology to neutralize tough ammonia odors before they start, keeping your litter box fresh longer.

Mix Heavy Duty Odor Block with your current litter for a few days, gradually increasing the ratio until you’re using only Heavy Duty. This helps your cat adjust to the new texture and scent.

Yes. Heavy Duty Odor Block is formulated with a low-dust blend to help keep your home cleaner and reduce airborne particles during pouring and scooping.