Abstract
EFFICACY STUDIES FINAL PROGRESS REPORT
Submitted to Cal/EPA, October 27, 1995
by
7C's Safety & Environmental Consultants
SUMMARY
It has been shown that tap water treated with Water PreserverTM Concentrate
(a blended proprietary formula of 5.25% Sodium hypochlorite solution), stored in
containers suitable for long-term drinking water storage, will remain potable for up to 8
years. It has also been shown that a quantity of water can be stored for a minimum of 10
years total by re-treating the water after 2-3 years.
Two continuous parallel Studies (Study #1 and Study #2) were performed on split samples
of water taken from one original water sample.
In Study #1, potable domestic tap water was treated with Water PreserverTM.
The water was stored in a 55-gal. drum for 29 months (2 years and 5 months) and then
analyzed.
In Study #2, the water from Study #1 (after analysis) was transferred from the drum and
split into three individual 2.5 gal. WaterCubeTM brand containers. Two of the
containers were treated with Water PreserverTM at the recommended rate of 8
drops/gal. and then stored. One container was left untreated and kept as a control sample.
Split samples were analyzed at 29, 37, 48, 63, 82, and 96 months.
RESULTS
Treated water stored in food-grade drums and WaterCube™ containers described in
Study #1 and #2, remained potable (met current standards for healthful drinking water) for
the duration of both Studies, as follows:
STUDY #1. Results of bacteriological analysis showed the stored water continued to meet
drinking water standards after a 29-month storage period.
STUDY #2. Results of the bacteriological analysis showed the untreated control sample
to contain unacceptably high levels of bacteria in the water. However, the treated water
met drinking water standards at each of six storage intervals, over an 8-year storage
period.
CONCLUSIONS
It was concluded that both of the container types used in the Studies are suitable for
use with Water PreserverTM and as containers for the long-term storage of
water. In addition, the "age" of the water (i.e. water directly from the tap vs.
tap water that as has been in storage for up to 29 months) is not a factor in the
effectiveness of the Water PreserverTM treatment.
Based on results of bacteriological analysis from Study #1 and Study #2, it was
concluded that Water PreserverTM is effective in preparing domestic (potable)
tap water for storage of up to 8 years, for use as emergency drinking water meeting all
common drinking water standards. Therefore, current 5-year storage recommendations on the
product label are validated and, in fact, provide a 60% storage life safety factor.
It has been shown that tap water treated with Water PreserverTM Concentrate
(a blended proprietary formula of 5.25% Sodium hypochlorite solution), stored in
containers suitable for long-term drinking water storage, will remain potable for up to 8
years. It has also been shown that a quantity of water can be stored for a minimum of 10
years total by re-treating the water after 2-3 years.
Two continuous parallel Studies (Study #1 and Study #2) were performed on split samples
of water taken from one original water sample.
In Study #1, potable domestic tap water was treated with Water PreserverTM.
The water was stored in a 55-gal. drum for 29 months (2 years and 5 months) and then
analyzed.
In Study #2, the water from Study #1 (after analysis) was transferred from the drum and
split into three individual 2.5 gal. WaterCubeTM brand containers. Two of the
containers were treated with Water PreserverTM at the recommended rate of 8
drops/gal. and then stored. One container was left untreated and kept as a control sample.
Split samples were analyzed at 29, 37, 48, 63, 82, and 96 months.
RESULTS
Treated water stored in food-grade drums and WaterCube™ containers described in
Study #1 and #2, remained potable (met current standards for healthful drinking water) for
the duration of both Studies, as follows:
STUDY #1. Results of bacteriological analysis showed the stored water continued to meet
drinking water standards after a 29-month storage period.
STUDY #2. Results of the bacteriological analysis showed the untreated control sample
to contain unacceptably high levels of bacteria in the water. However, the treated water
met drinking water standards at each of six storage intervals, over an 8-year storage
period.
CONCLUSIONS
It was concluded that both of the container types used in the Studies are suitable for
use with Water PreserverTM and as containers for the long-term storage of
water. In addition, the "age" of the water (i.e. water directly from the tap vs.
tap water that as has been in storage for up to 29 months) is not a factor in the
effectiveness of the Water PreserverTM treatment.
Based on results of bacteriological analysis from Study #1 and Study #2, it was
concluded that Water PreserverTM is effective in preparing domestic (potable)
tap water for storage of up to 8 years, for use as emergency drinking water meeting all
common drinking water standards. Therefore, current 5-year storage recommendations on the
product label are validated and, in fact, provide a 60% storage life safety factor.
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