The Doulton HCP, HIS and HIP water filter systems are available as a countertop or under sink drinking water system that uses Doulton ceramic filter technology. To ensure that the filter system is working at optimum performance, flow rate, and contaminate removal it is recommended to replace the ceramic filter at least once a year.
These systems originally came with the Ultracarb ceramic filter candle and several choices for the second filter. You can upgrade your Ultracarb to the CeraCarb ceramic filter candle for increased filter life without compromising your filtration level and continue to use the second filter of your choice.
| Doulton System | First Cartridge Options | Second Cartridge Options |
| HCP200, HCP210, HCS200, HCS210, HIP200, HIP210, HIS200, HIS210, HIP, HCP | Better - CeraCarb W9610300 1500 gal. or 12 months | Arsenic Reduction CF-A5-10S |
| MTBE Reduction M-1 | ||
| Nitrate Reduction CFA310S | ||
| Good - Ultracarb DUC-1000 600 gal. or 6 months | Fluoride/Heavy Metal Reduction AC-B2/10S | |
| Alkaline/ORP Enhancement AC-A/O/10S | ||
| 5 micron Sediment Filter SPCM-5 |