Karisa Martin

Date of Award


Document Type



Biological Sciences

First Advisor

Dr. Erik Lindquist

Second Advisor

Professor Ariela Vader


In many parts of the developing world, drinking water is held in household storage vessels. Drinking water may be contaminated at the source or during storage; effective water purification methods must address both potential contamination sites. This research investigated a two barrier purification method using Sawyer PointOne bucket filters, a point-of-use hollow fiber membrane filtration system, and post-filtration chlorination with AquaTabs®, a tablet product containing active ingredient sodium dichloroisocyanurate. Ten liters of distilled water were filtered through the Sawyer PointOne filters and stored with 67 mg of powdered AquaTabs in sealed plastic buckets at 20o C. Microbiological and free chlorine testing were conducted at 12 time points (0 minutes, 30 minutes, and in 1 day increments from 1 through 10 days). Free chlorine levels decayed as storage time increased, but remained above internationally accepted standards for chlorine residual in drinking water. Bacteria testing with the membrane filtration method at 5, 7, 8, 9, and 10 days showed growth of several colonies. Further research with varied source water quality is needed to evaluate the effectiveness of this two barrier water purification method.