Updated on January 8, 2024


Created on August 27, 2015

GravityPure UF

A community-scale gravity-fed water treatment unit.

Tested By
  • Dr. Nathan Hancock, Colorado School of Mines
Content Partners


Product Description

GravityPure UF is a gravity-driven water treatment system, sized for community or facility use and scalable from 500 to 10,000 liters per day. Interview with representative

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

Distributed by Healing Waters. Implemented by Healing Waters, Warzone Solutions, Food for the Hungry, World Orphan Fund, Compassion Uganda, Sustainable Missions and many others.

Manufacturing/Building Method

Batch assembled, up to 6 week lead time for large orders. Interview with the representative

Intellectural Property Type

Trade Secret

User Provision Model

The GravityPure UF is purchased from Healing Waters (infoathealingwatersdotorg) by non-profits, NGOs, and other organizations or facilities around the world with a need for water treatment. The Healing Waters Engineering Team will work with you directly to size your equipment and make sure it’s a good fit for your context.Interview with representative Shipping: 3 boxes or duffel bags, gross 54kg (for a 1-membrane unit)

Distributions to Date Status

Healing Waters has implemented over 200 water projects around the world. This particular design is newer, with 38 units produced to date.Interview with representative

Description of the combined methods

Ultrafiltration membrane

Manufacturer-specified water treatment rate (L/hr)

40 to 550 L/hr (for 1 to 4 membranes)

Bacteria reduction

>4 log

Virus reduction

>4 log

Protozoa reduction

>4 log

Heavy metals and/or arsenic reduction


Maximum recommended influent turbidity level (NTU)


Effluent turbidity levels (NTU)

<0.1 NTU

Safe water storage capacity (L)

55 L

Manufacturer-specified lifetime volume (L)




Design Specifications

GravityPure UF Dimensions: Assembled: 101 cm x 77 cm x 149 cm, 51 kg Typical assembly time: 2 hours Overview: Interview with representative Core treatment is ultrafiltration: 0.02-micon pores for removal of bacteria, viruses, and other waterborne diseases Process is low-waste, with typically >90% net water recovery Integrated bottle washing station for sanitizing inside of bottles Water Supply: Any fresh water supply (not salt water) Must be tested for chemical contamination Should be stored in an elevated holding tank. Power Supply: Must pump or manually feed water to at least 2 meters.

Product Schematics

Technical Support

Healing Waters Engineering Team. Interview with representative

Replacement Components

Extensive package of spare parts is included with each unit. Additional parts are available from Healing Waters, although many are locally available in urban areas. Interview with representative


The manufacturer provides a 1 year warrenty. Disposal is a mixture of non-hazardous waste and recyclable components (eg stainless steel frame). The most significant replacement cost is the Ultrafiltration Membrane. Typical membrane life is 2-5 years, with a $300 replacement cost. Interview with representative

Manufacturer Specified Performance Parameters

GravityPure UF can achieve a production rate from 500 to 10,000 liters per day depending on water pressure and number of parallel Ultrafiltration membranes.

Vetted Performance Status



No hazards noted.

Complementary Technical Systems

In some cases there may be a need for large water storage tank(s), sand pre-filtration, or activated carbon post-filtration. The Healing Waters Engineering Team will work with the users to make sure that they have the right solution for their context. Interview with representative

Academic Research and References

Healingwaters.org. Available: https://healingwaters.org/wp-content/uploads/2020/03/GravityPure_SpecSheet.pdf

“Clean Water Initiative,” Healing Waters International, 15-Nov-2023. Available: https://healingwaters.org/

“Home Page,” Food for the Hungry, 20-Apr-2023. Available: https://www.fh.org/

“The,” World Orphan Fund, 28-Feb-2022. Available: https://www.theworldorphanfund.org/

“Uganda,” Compassion.com. Available: https://www.compassion.com/about/where/uganda-facts.htm

Goal 6. (n.d.). Sdgs.un.org. Available: https://sdgs.un.org/goals/goal6

Compliance with regulations

The Ultrafiltration membrane is produced in an ISO 9001 certified facility and is NSF 61 listed. Interview with representative

Evaluation methods

Field and laboratory testing

Other Information


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