Color-changing silica gel litter that monitors your cat's health. Changes color to detect potential urinary issues.
Health monitoring
Lightweight
Monthly delivery
Virtually dust-free
Subscription required
Expensive
Doesn't clump
Health Monitoring: 10/10 · Odor Control: 8/10 · Value: 5/10 · Innovation: 10/10
These are our own scores for the things that can be judged from the specification, the materials and how the product is built. They are not Amazon's customer rating.
This is a silica gel crystal litter with a pH indicator, plus indicators that respond to blood. When urine hits it, the litter changes colour according to what it detects.
The published indications are broadly:
| Colour | What it indicates |
|---|---|
| Yellow to olive green | Normal urine pH range |
| Blue or dark green | Alkaline urine — associated with some urinary tract infections and struvite crystals |
It is a screening indicator, not a diagnosis. A colour change tells you something about urine chemistry at one moment. It does not tell you what is wrong, how serious it is, or what to do.
Two failure modes matter, in opposite directions:
False reassurance. A cat can have serious urinary or kidney disease with normal urine pH and no visible blood. Normal colour is not a clean bill of health, and it is not a reason to skip a check-up. This is the more dangerous of the two, because it is invisible.
False alarm. Diet, recent food changes, how long the urine sat before you looked, and other cats in the house can all affect what you see. A single odd colour is a reason to watch, not to panic.
The correct response to a colour change is to phone your vet and describe it, not to treat anything yourself.
Regardless of what colour the litter is:
A male cat that is straining in the box and producing little or nothing is a urinary blockage until proven otherwise. That is a life-threatening emergency and needs a vet immediately, out of hours if necessary. Blocked cats can die within a day or two. Do not wait to see what the litter says.
Other signs that need a vet promptly: frequent small visits to the box, crying in the box, visible blood, licking at the genitals excessively, toileting outside the box in a previously reliable cat, or hiding and not eating.
If you have more than one cat, the litter tells you that a cat produced abnormal urine. It does not tell you which.
That is a serious practical limitation, and it is worth being clear-eyed about it before subscribing. Options are separating cats temporarily to identify the source, or accepting that a positive reading means every cat needs assessment. With three cats and one box the information is close to unusable.
Silica crystals absorb urine and are designed to be stirred rather than scooped. Solids are removed daily; the crystals are replaced wholesale on a schedule rather than topped up.
Practical consequences:
You must remove solids daily, or the box smells regardless of the crystals.
Some cats dislike the texture. Crystals feel quite different underfoot from clay, and cats have strong litter preferences. Litter box aversion is a leading cause of house soiling, so a cat that starts toileting outside the box after a litter change is telling you something clear.
A cat that steps out of a crystal box tracks less than fine clay, which is a genuine plus.
Transition gradually if you switch — mix increasing proportions over a week or two rather than changing overnight.
This is sold on a recurring delivery model. That is legitimate, and it is the reason value scores lowest of the four: you are paying a premium for a monitoring feature on top of litter, every month, indefinitely.
Whether that is worth it depends on your cat. For a single cat with a history of urinary problems, ongoing pH and blood screening between vet visits has real value. For a healthy young cat in a multi-cat house, you are paying a monthly premium for information you may not be able to attribute.
Check the pause and cancellation terms before you start.
It screens urine pH and the presence of blood, which can flag urinary infections, crystals and inflammation earlier than you would otherwise notice. It is a screening indicator, not a diagnosis — it cannot tell you what is wrong or how serious it is. The correct response to a colour change is to phone your vet and describe it.
Yes, and this is the most important limitation. Cats can have serious urinary or kidney disease with normal urine pH and no visible blood. Normal colour is not a clean bill of health and is not a reason to skip a check-up.
Only partly. It tells you that a cat produced abnormal urine, not which one. With several cats sharing boxes you either separate them temporarily to identify the source, or accept that a positive reading means assessing every cat. That is a real limitation to weigh before subscribing.
Go back to what it used, and transition more gradually next time by mixing increasing proportions over a week or two. Crystals feel very different underfoot and cats have strong litter preferences. Litter box aversion is a leading cause of house soiling, which is a far worse problem than the one the litter screens for.
A male cat straining in the box and producing little or nothing is a suspected blockage and is life-threatening — go to a vet immediately, out of hours if necessary. Blocked cats can die within a day or two. Do not wait to see what colour the litter turns.