The Katadyn Drip is a tabletop ceramic filter containing three filter candles in an upper 10L bucket for dirty water and a lower 10L bucket for dispensing filtered water. It comes with either Ceradyn silver-impregnated ceramic filter candles or Gravidyn, which also contains activated carbon for chemicals removal.
SDG 6: Clean Water and Sanitation
SDG 2: Zero Hunger
Market Suggested Retail Price
Target Users (Target Impact Group)
Distributors / Implementing Organizations
Katadyn sells directly to consumers and has also partnered with the Mexican government, World Hope, and the Rotary Foundation for distributions of its filters.
Silicon, food-safe buckets can be bought from the manufacturer and produced in Switzerland or sourced locally for cheaper. Taps and maintenance kits can also be purchased separately from the manufacturer.
Intellectural Property Type
User Provision Model
Users can purchase the filter online from Katadyn, other online retailers, or from distributions by international relief organizations.
Distributions to Date Status
Katadyn filters are distributed to families participating in the Mexican government’s project “Sin Hambre,” which is run by the Ministry for Social Affairs. Since the project started, Katadyn has delivered over 60,000 filters to Mexico. Other distributions include the countries of Thailand, Bolivia, and Puerto Rico.
Type of filter
Ceramic candle filter
Primary material of construction
ceramic, colloidal silver, optional activated carbon
Manufacturer-specified flow rate (L/hr)
Manufacturer claims the Ceradyn version eliminates viruses greater than 0.2 microns in diameter. However reduction value is unknown.
Manufacturer claims the Ceradyn version eliminates protozoa, and cysts, greater than 0.2 microns in diameter. However reduction value is unknown.
Heavy metals and/or arsenic reduction
Maximum recommended influent turbidity level (NTU)
Effluent turbidity levels (NTU)
Scrub filter element with included cleaning pad when flow is reduced
Manufacturer-specified lifetime volume (L)
Safe water storage integration
The Katadyn Drip weighs 3.3 kg and is 45 by 25 cm. It is a gravity household water filter for 1 to 6 people, with 4 liters per hour filtration through three ceramic filter candles. It comes in two versions: the Ceradyn and the Gravidyn, where the Gravidyn contains an additional activated carbon element for chemicals and chlorine reduction. The filters are designed to be long-life, low-maintenance, and last 2 to 9 years.
Technical support is provided in the instruction manual online.
Filter candles need to be replaced after the end-of-life measuring gauge indicates that the filter is too small and water flow has diminished. Replacement Ceradyn and Gravidyn filter candles are available for purchase online.
The Ceradyn filter cartridge capacity is 50,000 liters per filter, so for the Katadyn Drip, which contains three filter candles, the lifetime capacity is 150,000 liters. For a family consuming 15 L of drinking water per day the expected lifetime of the Ceradyn filters candles are 9 years with low turbidity or 2 years with high turbidity. The full Katadyn Drip system comes with a 2-year warranty.
Manufacturer Specified Performance Parameters
The Ceradyn version eliminates bacteria, protozoa, cysts, algae, spores, sediments and viruses in combination with particles greater than 0.2 microns. The Gravidyn version also reduces chemicals.
Vetted Performance Status
A randomized controlled field trial found that Katadyn Drip ceramic filters were effective at improving the microbiological quality of drinking water in a low-income community in rural Bolivia in 2004. Independent labs Bachema and Spectrum also confirmed the bacteriological reduction of the Ceradyn and Gravidyn filters in a controlled setting.
To prevent contamination of the filtered water, the instruction manual recommends: letting filter elements dry completely in the air if the filter is not going to be used for longer than two days, cleaning the filter system (container and filter elements) at least once a month, keeping it out of direct sunlight,
Complementary Technical Systems
Academic Research and References
Safe household water treatment and storage using ceramic drip filters: a randomized controlled trial in Bolivia
Clasen T, Brown J, Suntura O, Collin S; (2004) Water Sci Technology
“Katadyn Group,” Katadyngroup.com. Available: https://www.katadyngroup.com/int/en
CAWST, “Project: Sin Hambre Project, Mexico, Drip Ceradyn Filter,” Project: Sin Hambre Project, Mexico, Drip Ceradyn Filter | Household Water Treatment and Safe Storage Knowledge Base. Available: https://www.hwts.info/projects/6bd60466/sin-hambre-project-mexico-drip-ceradyn-filter
CAWST, “Project: Rotary Club of Switzerland, Thailand, Drip Ceradyn Filter,” Project: Rotary Club of Switzerland, Thailand. Household Water Treatment and Safe Storage Knowledge Base. Available: https://www.hwts.info/projects/8d778220/rotary-club-of-switzerland-thailand-drip-ceradyn-filter
Goal 6. (n.d.). Sdgs.Un.Org. available: https://sdgs.un.org/goals/goal6
CAWST, “Manufacturer Sheet: The Katadyn Drip Filters. Gravity Water Filtration Units,” . Gravity Water Filtration Units. Household Water Treatment and Safe Storage Knowledge Base. Available: https://www.hwts.info/document/f8b48620/the-katadyn-drip-filters-gravity-water-filtration-units
CAWST, “Katadyn Drip Filter,” Katadyn Drip Filter. Available: https://www.hwts.info/products-technologies/e3cb323b/katadyn-drip-filter/technical-information
CAWST, “undefined: Reduction Test Katadyn Drip FIlter Ceradyn,” undefined: Reduction Test Katadyn Drip FIlter Ceradyn . Available: https://www.hwts.info/document/9223ad62/reduction-test-katadyn-drip-filter-ceradyn
Compliance with regulations
The Katadyn Drip filters meet the USEPA Guide Standard and Protocol for Testing Microbiological Water Purifiers for 6 log bacteria and 4 log cyst removal.
Laboratory water quality testing under batch conditions and field evaluations in Bolivia.
No backflushing needed.