Updated on December 7, 2023

·

Created on September 27, 2018

Rainfresh MP4U Gravity Filter

The Rainfresh MP4U Gravity Filter is a silver-impregnated ceramic tabletop filter.

Tested By
  • Canadian Standards Association (CSA)
  • University of Arizona
Content Partners
  1. Centre for Affordable Water and Sanitation Technologies (CAWST)

Author

Product Description

The Rainfresh MP4U Gravity Filter is a tabletop filter produced by the Canadian company Envirogard Products Ltd. and distributed in disaster response scenarios by Global Medic. The filter setup consists of four silver-impregnated ceramic cartridges, two buckets, a spigot for dispensing water, a filter gauge, cleaning mesh, and the necessary hardware for installation. The user fills the top bucket with dirty water and lets the clean water pass through the filters and into the bottom bucket at a max flow rate of 3 liters per hour.

Target SDGs

SDG 6: Clean Water and Sanitation

SDG 7: Affordable and Clean Energy

Market Suggested Retail Price

$135.00

Target Users (Target Impact Group)

Household, NGOs

Distributors / Implementing Organizations

Envirogard Products Ltd. manufactures the ceramic filter cartridges, the buckets, spigots, and other components are manufactured separately and shipped together or obtained locally and assembled on-site.

Competitive Landscape

Manufacturing/Building Method

Envirogard Products Ltd. manufactures the ceramic filter cartridges, the buckets, spigots, and other components are manufactured separately and shipped together or obtained locally and assembled on-site.

Intellectural Property Type

Trademark

User Provision Model

Users can obtain the product from Global Medic when it is distributed during natural disasters, displacements, and in refugee or internally-displaced peoples camps. It is also available for sale online from Envirogard for $135.

Distributions to Date Status

Partner NGO Global Medic has distributed more than 25,800 RainFresh Gravity Water Filters in Lebanon, Haiti, Somalia, the Philippines, Nepal, Vanuatu, Sudan, Pakistan, and Cambodia.

Type of filter

Ceramic candle (cartridge) filter

Primary material of construction

Silver-impregnated ceramic

Additives

No

Manufacturer-specified flow rate (L/hr)

3 L

Bacteria reduction

6 (99.9999%)

Virus reduction

Unknown

Protozoa reduction

Log 3 reduction of protozoan cyst (such as cryptosporidium & Giardia)

Heavy metals and/or arsenic reduction

Unknown

Maximum recommended influent turbidity level (NTU)

<0.5

Effluent turbidity levels (NTU)

Unknown

Maintenance schedule

Scrub filter cartridges every 3-5 days

Manufacturer-specified lifetime volume (L)

15,140 L

Safe water storage integration

25

Design Specifications

The filter setup consists of four Envirogard 7300G silver-impregnated ceramic cartridges in an upper 25L bucket over a sealed bottom 25L bucket with a spigot for dispensing water. It comes with a filter gauge for measuring the end-of-life of the ceramic candle, cleaning mesh, and the necessary hardware and pictoral instruction manual for installation.

Product Schematics

Technical Support

Available during distributions from the partner NGO or through contacting the manufacturer.

Replacement Components

The four Envirogard 7300G silver-impregnated ceramic filter cartridges must be replaced after filtering 15,000 L or 12 months. The upgraded 7500G filter cartridges with an activated carbon core for taste and odor reduction are available for sale in Canadian hardware stores or online in packs of four for $90 but may be available for cheaper from the distributing NGO.

Lifecycle

The four Envirogard 7300G silver-impregnated ceramic filter cartridges must be replaced after filtering 15,000 L or 12 months. The filter gauge is used after cleanings to measure wear on the ceramic filter and indicates end-of-life.

Manufacturer Specified Performance Parameters

Rainfresh P2S siphon water filter units are designed to be affordable, mass-produced, easy to assemble and use, and last a family of five drinking 3 L/day each a full year.

Vetted Performance Status

The four Envirogard 7300G silver-impregnated ceramic filter cartridges must be replaced after filtering 15,000 L or 12 months. The filter gauge is used after cleanings to measure wear on the ceramic filter and indicates end-of-life.

Safety

No known safety risks if properly used and bottom bucket remains properly sealed against recontamination.

Complementary Technical Systems

None

Academic Research and References

“Globalmedic – disaster relief,” globalmedic, 08-aug-2019. Available: https://globalmedic.ca/

“bucket gravity water filter – traps and kills harmful bacteria (e. Coli),” rainfresh online store, 18-oct-2017. Available: https://rainfreshstore.ca/product/mp4-gravity-water-filter-ceramic/

Emily mathieu business reporter, “a canadian source for clean water in haiti,” the toronto star, toronto star. Https://www.thestar.com/business/a-canadian-source-for-clean-water-in-haiti/article_ca03263d-bd84-5f64-9169-19bed55dd89f.html 

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

“#rainfreshhelps,” rainfresh. Available: http://rainfresh.ca/category/rainfresh-helps/

“bucket gravity water filter for clean safe drinking water,” rainfresh, 02-feb-2017. Available: https://rainfresh.ca/product/bucket-gravity-water-filter/

“contact,” rainfresh, 27-may-2015. Available: http://rainfresh.ca/contact/

Cawst, “manufacturer sheet: rainfresh 7300g/ 7500g ceramic filter cartridges,” available: https://www.hwts.info/document/6cb1a2dc/rainfresh-7300g-7500g-ceramic-filter-cartridges

“ceramic filter for gravity units -traps and kills harmful bacteria (e. Coli),” rainfresh online store, 15-feb-2018. Available: https://rainfreshstore.ca/product/ceramic-filter-gravity-water-filter-4-pack/

“assembly and operating instructions -siphon water filter model p2s please save for future reference,” rainfresh.ca. Available: https://rainfresh.ca/wp/wp-content/uploads/2017/02/p2s-instructions-oct-2008.pdf

“bucket gravity water filter for clean safe drinking water,” rainfresh, 02-feb-2017. Available: https://rainfresh.ca/product/bucket-gravity-water-filter/#tab-product_editor_12294_tab

Cawst, “evaluation: evaluation of the rainfresh ceramic filter model sst 7700 for the remova. Available: https://www.hwts.info/document/f318aad9/evaluation-of-the-rainfresh-ceramic-filter-model-sst-7700-for-the-removalinactivation-of-bacteria-an

“university of arizona in tucson, az,” arizona.edu. Available: https://www.arizona.edu/

 “product certification & standards development,” csa group, 12-aug-2018. Available: https://www.csagroup.org/

Compliance with regulations

Rainfresh ceramic filter cartridges are tested and certified by CSA International to NSF53 for reduction of protozoa.

Evaluation methods

Laboratory testing with purified water seeded with microbiological contamination.

Other Information

None

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