The M-Drop is a porous ceramic tablet embedded with silver and/or copper nitrate. It is placed in a household drinking water storage container for water disinfection.
SDG 6: Clean Water and Sanitation
SDG 3: Good Health and Well-Being
Market Suggested Retail Price
Target Users (Target Impact Group)
Distributors / Implementing Organizations
Non-governmental organizations, Universities, Faith-Based Organizations and Private Parties including Agua y Vida, Wine to Water, Ultimate Mission, & St Paul's Episcopal Church.
M-Drop tablets are manufactured from clay, sawdust, silver and/or copper nitrate, pressed into shape and fired to a ceramic state
Intellectural Property Type
User Provision Model
Users can obtain the product from organizations, agencies and private parties including Agua y Vida, Wine to Water, Ultimate Mission, St Paul's Episcopal Church.
Distributions to Date Status
Active Chemical and concentration (%)
Ceramic tablet embedded with silver and/or copper nitrate
Dosing method: Batch or flow-through
Dosing method: Automatic or manual
One M-Drop tablet per 10 L of water
Contact time (min)
Minimum 600; 10 – 24 hours depending on water quality to be treated.
Target free disinfectant residual (mg/L)
Target silver ion concentration is <0.1 mg/L
Heavy metals and/or arsenic reduction
Treatment lifespan (days)
The M-Drop remains in the water storage container, when more water is added, the MadiDrop will continue working and lasts for 6 months or longer.
Maximum recommended influent turbidity level (NTU)
M-Drop is a small tablet of porous clay embedded with silver. When placed in water silver ions are released gradually and disinfect waterborne pathogens. Silver concentration is below 0.01 mg/L and a 6 log in bacteria reduction and 1 log virus and protozoa reduction can be achieved after 10-24 hours, depending on how contaminated the water is. Additional specifications: Weight: 50 grams; Length: 9.0cm; Height: 1.7; cm; Width: 3.5 cm.
The M-Drop is placed in the water storage container and left there for 6 months. The user should avoid moving the M-Drop from container to container as this will reduce its effectiveness. The M-Drop works best when left in a container for at least several days, preferably weeks and months. The water storage container can be cleaned as needed. The M-Drop should be handled as little as possible to prevent the oil on skin from clogging the pores but it can be cleaned by rubbing it between hands, or gently scrubbing it with a clean brush. The user must remember to replace the M-Drop after 6 months.
A supply chain is needed to purchase additional or replacement MadiDrops locally.
Approximately 6 months; To discard a M-Drop users need to simply throw them away into the trash, or break it into pieces and disperse them on the ground.
Manufacturer Specified Performance Parameters
Performance targets 6 log bacteria removal, 1 log virus and 1 log protozoa removal.
Vetted Performance Status
Porous Ceramic Tablet Embedded with Silver Nanopatches for Low-Cost Point-of-Use Water Purification, Performance and Acceptance of Novel Silver Impregnated Ceramic cubes for Drinking Water Treatment in Two Field sites: Limpopo Province, South Africa and Dodoma region, Tanzania
Manufacturer reports silver elution is below USEPA secondary guideline values of 0.1 mg/L.
Complementary Technical Systems
Can be used in conjunction with boiling or filtration technologies to prevent post-treatment contamination during storage.
Academic Research and References
J. A. Smith, B. Ehdaie, and C. Krause, “Porous metal ceramic materials and methods for making and using the same,” 2014071346:A1, 08-May-2014. https://patents.google.com/patent/WO2014071346A1/en?oq=james+a+smith+ceramic+metal+water+treatment+virginia
Compliance with regulations
Depends on local market regulations. MadiDrop offers support to distributors and resellers to obtain local certification.
Field & Laboratory evaluations, see academic research.
Video on M-Drop.