If you own a PETKIT PuraX or PuraMax self-cleaning litter box, you already know that the convenience comes with a recurring cost: replacement refills. Among these, the air purifying refills are designed to tackle odors, and PETKIT sells them in a four-pack of bottles containing a liquid formula. This review takes a closer look at what these refills actually do, how well they perform in everyday use, and where they might fall short.
First, a quick primer on how these refills fit into the litter box ecosystem. The PuraX and PuraMax models include a built-in air purifier that uses a liquid cartridge to neutralize odors as air passes through. The refill bottles are simply the replacement liquid for that cartridge. Each bottle is 100% natural ingredients, according to PETKIT, and is marketed as an odor eliminator that works quickly. The four-pack is intended to last several months, depending on usage and the number of cats.
In real-world use, the refills are straightforward to install. You unscrew the old cartridge, pour in the new liquid, and replace it. The box’s app or indicator light will remind you when it’s time for a change, which is helpful because it’s easy to forget otherwise. The liquid itself has a mild, plant-based scent that isn’t overpowering—more of a neutral freshness than a perfume. That’s a plus for cats with sensitive noses and for people who dislike artificial fragrances.
Performance-wise, the refills do make a noticeable difference in odor control, but they’re not a magic bullet. In a single-cat household with regular scooping and the self-cleaning cycle running as scheduled, the air purifier with a fresh refill keeps the immediate area around the box smelling neutral for a couple of weeks. After that, the effect gradually diminishes. With multiple cats, you’ll likely need to replace the refill more frequently—perhaps every two to three weeks—to maintain the same level of odor control. It’s also worth noting that the refills work best in conjunction with good litter and routine maintenance; they won’t compensate for a dirty box or poor ventilation.
One limitation is the cost. These refills are proprietary, meaning you can’t use third-party liquids without risking damage to the unit. Over time, the expense adds up, especially for multi-cat homes. Compared to generic odor absorbers like baking soda or activated charcoal bags placed near the litter box, the PETKIT refills are more expensive and less versatile. However, they offer the convenience of being integrated into the box’s air purifier, which many users find worth the premium. If you’re looking for a low-cost alternative, you might consider a standalone air purifier or simply more frequent litter changes, but those come with their own trade-offs in convenience and effectiveness.
Another trade-off is the environmental impact. While the ingredients are natural, the packaging is plastic, and the bottles aren’t typically recyclable in all areas. That’s something to consider if sustainability is a priority. On the other hand, the four-pack reduces shipping frequency compared to buying single bottles, which is a small mitigating factor.
So, who are these refills for? They’re clearly aimed at PETKIT PuraX and PuraMax owners who want to maintain the odor-control functionality of their litter box without hunting for alternatives. If you have one or two cats and change the refill as recommended, you’ll likely find them effective and convenient. They’re also a good fit for people who prefer natural ingredients and mild scents over harsh chemicals.
Who might want to skip them? If you’re on a tight budget or have many cats, the recurring cost could be a deterrent. Also, if you’re handy with DIY solutions or already use a high-quality odor-absorbing litter, you might find the refills redundant. And if your litter box is in a well-ventilated area with minimal odor issues, the benefits may be less pronounced.
In summary, the PETKIT Air Purifying Refills are a functional accessory that does what it claims, with some caveats. They’re not essential for the litter box to operate, but they add a layer of odor control that many owners appreciate. Just go in with realistic expectations: they’re a maintenance item, not a permanent fix, and the cost is part of the ownership experience.