Updated on January 3, 2024


Created on August 3, 2016


MDrop or MadiDrop is a water disinfection tablet.

Tested By
  • Department of Civil and Environmental Engineering, University of Virginia
Content Partners


Product Description

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.

Target SDGs

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.

Manufacturing/Building Method

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


Dosing quantity

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

Bacteria reduction

6 log

Virus reduction

1 log

Protozoa reduction


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)

Not Applicable

Design Specifications

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.

Product Schematics

Technical Support

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.

Replacement Components

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.

Compliance with regulations

Depends on local market regulations. MadiDrop offers support to distributors and resellers to obtain local certification.

Evaluation methods

Field & Laboratory evaluations, see academic research.

Other Information

Video on M-Drop.

Comments from the Community

1 Comment

  1. E4C.COMMENTS says:

    Emily says:

    Distribution to date: the published number on their website is 664.

Leave a Reply

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