March 2021 Roshan Water™ Newsletter

VeloCens™️ adheres to standards of microbiological testing described by ISO 13843:2017: Water Quality Requirements for Establishing Performance Characteristics of Quantitative Microbiological Methods. Our device has been calibrated for quantification of E.coli and Total Coliform using field samples according to this standard. We have been making improvements to our testing method to improve the false positive rate of tests. We are happy to report that we have successfully lowered the rate of our false positive results from 35% to only 7%. This is comparable to the 5% false positive rate in standard laboratory methods.This puts us on track for our US EPA-Alternate Test Procedures Study and subsequent submission.

VeloCens™ 3T and 5T versions (3 sample and 5 sample testing capability, respectively) are planned to be delivered in a few weeks for the start of our Phase 2 Field Test Program. With 10 participants on board, more than 200 E.coli and Total Coliform tests will be performed. Comparison of VeloCens™ results against standard laboratory methods will be an important outcome.