Our filters have been tested on numerous occasions with positive results by universities, national bodies as well as in the field. For copies of the test results, click on the icons below:
Two Grifaid® Family Filters were tested to USEPA recommendations. The results were bacteria retentions of log 6 to 8.23 (USEPA guidelines are log 6), and virus retention log 4.9 to 5.75 (USEPA guidelines are log 4). Click the image on the left to see a copy of the test results.
A Grifaid® Community Filter was tested to USEPA recommendations. The results were a bacteria retention of log 9. Click the image on the left to see a copy of the test results.
Tested with positive results.
Testing for e.coli before and after filtration during a field trip to Ghana in 2015
Grifaid® Family and Community Filters have been in use in two sites in The Gambia for years. Their performance has been periodically monitored and after inspecting them in June 2013, it was concluded that:
“To date filters have lasted four years with no sign of coming to the end of their working life. On the basis of these results it is predicted that they should last at least 5 years. Continued evidence may extend this prediction.”
OF CLEANING PROCEDURES
Tests were also conducted at Newcastle University in 2011/2012 on a Grifaid® Family Filter to test the effectiveness of cleaning procedures. This was done in two stages:
The feed water was dosed with mud, and the filter operated automatically until it became clogged. Cleaning procedures produced 100% recovery in flow rate.
The feed water was dosed with live yeast to replicate biological contaminants, and the filter was operated automatically until it became clogged. The cleaning procedure achieved an 80% recovery.