Updated on September 25, 2023

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Created on September 27, 2018

Rainfresh P2S Siphon Water Filter

The Rainfresh P2S Siphon Water Filter is a single silver-impregnated ceramic filter cartridge with attached tubing that comes with two water containers and a filter gauge.

Developed By Unknown
Tested By
  • Canadian Standards Association (CSO)
Content Partners
Unknown

Author

Product Description

Rainfresh P2S Siphon water filter comprises of an Envirogard 7300G silver-impregnated ceramic filter with tubing attached, two separate water containers, one for the untreated water and the other for safe drinking water. Untreated water is poured in one of the containers which is then placed at a vertical height of not less than 1 meter. The second container is placed at the ground level. The ceramic filter is placed in the dirty water container with the tube running down to the empty container. Suction is applied to the end of the tube and water slowly passes through the ceramic filter and safe drinking water drips into the empty container at a max flow rate of 4.6 liters per hour. The included scrub pad and filter gauge are for cleaning the filter and measuring end-of-life.

Target Regions

Worldwide

Target SDGs

SDG 6: Clean Water and Sanitation

Target Users (Target Impact Group)

Household, Community

Distributors / Implementing Organizations

The product is new on the market as of February 2018 and not yet distributed.

Competitive Landscape

Direct competitors include Tulip Siphon Filter.

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

Trademarked

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 not yet available for sale online or in stores.

Distributions to Date Status

Unknown

Type of filter

Ceramic candle (cartridge) filter

Primary material of construction

Silver-impregnated ceramic

Additives

No

Manufacturer-specified flow rate (L/hr)

0.75-1.5 L

Bacteria reduction

6 log

Virus reduction

Unknown

Protozoa reduction

3 log reduction of protozoan cysts (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 cartridge every 3-5 days

Manufacturer-specified lifetime volume (L)

3,785 L

Design Specifications

Rainfresh P2S Siphon water filter comprises of an Envirogard 7300G silver-impregnated ceramic filter with tubing attached, two separate 35 liter water containers, one for the untreated water and the other for safe drinking water. Untreated water is poured in one of the containers which is then placed at a vertical height of higher than 1 meter. The second container is placed at the ground level. The ceramic filter is placed in the dirty water container with the tube running down to the empty container. Suction is applied to the end of the tube and water slowly passes through the ceramic filter to create a siphon and safe drinking water drips into the empty container at a max flow rate of 4.6 liters per hour. The included scrub pad and filter gauge are for cleaning the filter and measuring end-of-life.

Product Schematics

Technical Support

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

Replacement Components

The Envirogard 7300G silver-impregnated ceramic filter cartridge must be replaced after filtering 3,875 L or within 6 to 12 months. The upgraded 7500G filter cartridge with an activated carbon core for taste and odor reduction is available for sale in Canadian hardware stores or online individually for $26 or in packs of four for $90 but may be available for cheaper from the distributing NGO.

Lifecycle

The Envirogard 7300G silver-impregnated ceramic filter cartridge must be replaced after filtering 3,875 L or within 6 to 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 Gravity water filter units are designed to be affordable, mass-produced, easy to assemble and use, and last an individual drinking 3 L/day a full year.

Vetted Performance Status

The Envirogard 7300G filter cartridges are tested and certified by CSA International to NSF53 for 3 log reduction of protozoan cysts (such as cryptosporidium & Giardia). The University of Arizona also found 6 log removal of bacteria including: E. coli, Salmonella typhimurium (typhoid), Vibrio Cholera, and Shigella (cause of dysentery) under very low turbidity conditions of <0.5 NTU.

Safety

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

Complementary Technical Systems

None

Academic Research and References

None

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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