Ultra MAX Odor-Eliminating Probiotics Cat Litter Box Additive, 17.6-oz bag

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About This Item

Details

  • This odor-eliminating additive is compatible with all types of cat litter (sold separately).
  • It is formulated to provide maximum, long-lasting odor control for 30 days.
  • Made with a multi-strain probiotic formula to prevent odors from forming.
  • The waste-activated formula effectively eliminates odors.
  • An odor-sealed solution to keep your litter box environment fresh and clean.

Ingredients

Instructions

A Luxurious Litter Experience

Formulated from super-absorbent silica gel, these crystals provide outstanding instant and long-term odor control. They are soft and gentle on paws, 99% dust-free, and super lightweight for easy handling.

The Crystal Clear Winner for Every Cat

From signature Micro Crystals to one-of-a-kind Pearls, Ultra truly offers a crystal-clear winning litter for every cat.

About Ultra

As America’s original crystal cat litter, Ultra continues to earn the loyalty of cat parents across the country with its impeccable quality and value, ensuring all cat families get the best of what litter has to offer.

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Questions & Answers

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3.9
Rated 3.9 out of 5 stars
18 Ratings

18 Customer Reviews



Rated 3 out of 5 stars
By Christina on Dec 31, 2025
Received Free Product

Works, but not cost effective for multiple boxes

When I first saw this product it seemed like exactly what I was looking for. I have a lot of cats and have a lot of litter boxes. I use pine litter, which is amazing

When I first saw this product it seemed like exactly what I was looking for. I have a lot of cats and have a lot of litter boxes. I use pine litter, which is amazing at neutralizing the smell of urine, but does almost nothing for the smell of feces. I sometimes buy either clay or silica litter to mix in with the pellets to help with the odor, but this product looked like a perfect solution. However, it ended up not working out for me. I did not realize that you have to use an entire bag in ONE litter box. I thought I could just sprinkle it into the litter like I do with other litters, but I guess it requires more. I tried it with half the bag the first time, and it definitely helped with the odor. But that's when I encountered the next issue. I scoop the boxes twice a day, and with pine pellets you have to sift out the sawdust. So, in sifting out the sawdust I am pretty much scooping out this additive as well. This wouldn't be that big of an issue if it didn't require using the entire bag in one box. I just don't see the value considering the cost of this additive. Even if you only have one cat, that is a big expense to add on since you still have to buy litter. It does seem to work though, so if you have only one box, and don't scoop it that often, then this might work well for you. It just wasn't for us.


Rated 5 out of 5 stars
By Smudges mom on Jan 13, 2026
Received Free Product

Litter Additive is a Win!

I’ve always wanted to try a litter additive as I have an elderly kitty and when she uses her box the smell can be strong. This additive has a nice scent, blended

I’ve always wanted to try a litter additive as I have an elderly kitty and when she uses her box the smell can be strong. This additive has a nice scent, blended in well with the litter and definitely helped minimize odor. My cat also can be finicky about her litter and she had no issue with me adding the additive. I will definitely order again.


Rated 4 out of 5 stars
By Joni P on Jan 1, 2026
Received Free Product

Serious Odor Control

The Ultra MAX Odor-Eliminating Probiotics Cat Litter Box Additive really controlled the litterbox odor. For the daily cleaning, there was no detectible urine or

The Ultra MAX Odor-Eliminating Probiotics Cat Litter Box Additive really controlled the litterbox odor. For the daily cleaning, there was no detectible urine or feces odor coming from the box. The only downside to this product is the bag is one-time use only. My home has four cats and four litter boxes which are refreshed weekly. To use this product in four boxes per week would get costly. The product, in my opinion, would be better suited for a single cat home where the litter is not refreshed as frequently.


Rated 3 out of 5 stars
By Hnuttz on Dec 23, 2025
Received Free Product

Not fake or artificial smelling

Im not obsessed with it but after switchibg back to free and clear unscented clay litter i noticed of my multioke litter boxes the cats always faviured one box

Im not obsessed with it but after switchibg back to free and clear unscented clay litter i noticed of my multioke litter boxes the cats always faviured one box. So it got used a lot and always smelled more than the ither boxes regardless of how often i cleaned or out new litter. I added half a bag of this even though it says a full bag and i actually dont think it smells. It may have eliminated the urine ordors and doesnt smell fake or fragranced. So im gonna get anither one and do a second round full bag in each box and see how long it last cus its been over a week and right now it seems to work?


Rated 4 out of 5 stars
By Hopeless on Dec 27, 2025
Received Free Product

Definitely helps with the odor!

I have three litter boxes. Two are litter robots and one is a regular oversized litter box. The litter robots are the most popular since my spilled cats hate using

I have three litter boxes. Two are litter robots and one is a regular oversized litter box. The litter robots are the most popular since my spilled cats hate using litter boxes with more than one clump in it already. After adding this to my regular litter box my cats are using it more often. I noticed less of an odor in that room and the clumps are still firm and easy to scoop. I will add to my subscription.


Rated 4 out of 5 stars
By Jack on Dec 28, 2025
Received Free Product

It Works Well But Price Would Be A Consideration.

We have used it in regular and automated litter boxes with no problems. It seems to do the job consistently and as well if not better than someb of the best litter

We have used it in regular and automated litter boxes with no problems. It seems to do the job consistently and as well if not better than someb of the best litter odor control products we've used in the past. No cat box or ammonia smell at all. Purchase, however, would depend on price versus other similar products, thus 4 stars because we don't know what it would retail for.


Rated 4 out of 5 stars
By BanesMom on Jan 2, 2026
Received Free Product

Ultra Max Odor Eliminator

Tried out the Ultra Max Odor Eliminating probiotics for litter. It definitely helps minimize the smell of 2 cats using the littler box. I would definitely try it

Tried out the Ultra Max Odor Eliminating probiotics for litter. It definitely helps minimize the smell of 2 cats using the littler box. I would definitely try it again. Having 2 cats we go through a lot of litter changes and this helped it last a little longer than normal.


Rated 5 out of 5 stars
By Paige on Jan 2, 2026
Received Free Product

Seems like a great product

I set this aside for a few days until I could deep clean the litter boxes. My cats couldn’t wait and kept trying to get into this bag. I figured that was a good

I set this aside for a few days until I could deep clean the litter boxes. My cats couldn’t wait and kept trying to get into this bag. I figured that was a good sign! I’ve added it to one box and everything is going swimmingly so far.


Rated 3 out of 5 stars
By Scormier on Jan 12, 2026
Received Free Product

Any litter match

I would recommend this product to eliminate the smell of the litter box. I can’t stand the smell of a litter box that hasn’t been cleaned at least 2x a week so this

I would recommend this product to eliminate the smell of the litter box. I can’t stand the smell of a litter box that hasn’t been cleaned at least 2x a week so this product allows a few extra days


Rated 3 out of 5 stars
By calliekoo on Dec 27, 2025
Received Free Product

Seems to do the trick.

I have added the product to my cat litter and it seems ok. My cats have not rejected their litter boxes so we shall see. I haven't had the product long enough

I have added the product to my cat litter and it seems ok. My cats have not rejected their litter boxes so we shall see. I haven't had the product long enough to know its effectiveness but the cats don't seem to mind it at all.