Test Reports
We believe filtration claims should be supported by evidence.
Every Claii filter uses a Doulton® Ultra Sterasyl ceramic candle, made in England since 1826. Below are the independent laboratory reports for that element, including its NSF certification.
We didn't test it ourselves. Doulton did, through independent laboratories, and the element is certified to NSF/ANSI standards. Read and download them below.
| Contaminant | Reduction |
|---|---|
| Microplastics (NSF/ANSI 401) | >99.9% |
| PFAS (PFOA + PFOS combined) | >95% |
| Giardia cysts | >99.99% |
| Bacteria (E. coli, Typhoid, Klebsiella) | >99.99% |
| Turbidity / sediment | >99% |
| Cryptosporidium cysts | 99.99% |
| Chlorine (free chlorine) | >99% |
| Lead | Up to 95% |
| Pesticides, herbicides, fungicides & pharmaceuticals (overall group) | >90% |
|
✓ |
* Retains naturally occurring minerals such as calcium and magnesium
View the full laboratory test reports below to learn more about the filtration performance of our filter candles.
DOWNLOAD TEST REPORTS
Doulton Ultra Sterasyl PFAS Reduction
Doulton Ultra Sterasyl Pharmaceutical Reduction
Doulton Ultra Sterasyl Heavy Metals Reduction
Doulton Ultra Sterasyl Chemical Reduction