Doulton water filters

World class ceramic water filters

Toll free in U.S.A and Canada
Countertop filters   Undersink   Shower Filter   Whole House Water Filters/Softeners   Instant Hot   Instant Hot/Cold   Chillers   Replacement Cartridges   Faucets   Industrial   Commercial   Portable   Boats/RV's Systems   Accessories   All products   view shopping cart
Home
Contact us
Terms
About Doulton
FAQ
The candle
Test results
Compare
Technology
SPECIALS
In news
About water
Site Plan
User's guide
Online transactions via a secure server
FINAL REPORT -Spectrum Labs Inc.

DOULTON UNDERCOUNTER DRINKING WATER SYSTEM WITH SINGLE ULTRACARB CERAMIC CANDLE

Chlorine Reduction

Chlorine reduction filters

Other Doulton system tests

Report Number - 0561AU-010694 - revision 1

To: Mr. Anthony Frost, Doulton Water Care, Filleybrooks, Stone, Staffordshire, ST150PU
From: Spectrum Labs Inc., 301 West County Road E2, New Brighton, MN 55112

November 15, 1994

original signed by:
Sandra L. Games (15/11/94) and Margeret L. Bicking (22/11/94)

Introduction
Doulton Water Care has developed a proprietary drinking water treatment system that utilizes a radial flow activated carbon block filter cartridge in conjunction with a ceramic candle to remove specific contaminants from drinking water. This product is designed for long life filtration and is available directly through Doulton Water Care to distributors and retailers of point of use (POU) home water filtration systems.

The use of activated carbon block filter cartridges incorporating proven sorbent technology is becoming more prevalent in the design and development of drinking water treatment devices as manufacturers seek to combine the contaminant reduction capabilities of both organics and heavy metal removal technology. Ceramic filter cartridges are commonly used for the removal of harmful bacteria and cysts. Each technology has been established as an effective means for specific contaminant reduction under defined operating conditions.

Reliable information on contaminant removal capabilities is important in marketing this product to potential distributors and to the general public. Furthermore, several states have now implemented regulations which govern the sale and marketing of residential water treatment systems. Therefore, it is now necessary to have verification of contaminant reduction claims by a state certified independent third-party laboratory, using an approved protocol. Spectrum Labs, Inc. is pleased to provide this laboratory report as the result of an independent evaluation of the Doulton HIF undercounter drinking water treatment system containing an Ultracarb filter cartridge for chlorine reduction

Experimental Section

Selection of Analytes and Spiking levels

The Doulton HIP undercounter drinking water treatment system containing an Ultracarb filter cartridge was evaluated for chlorine reduction in accordance with test protocol contained in NSF International Standard Number 42. "Drinking Water Treatment Units/Aesthetic Effects." Appendix B, "Chemical Unit Test Methods." Section I, "Procedure - Plumbed-In Units and Faucet Mounted Taste, Odor and Chlorine Reduction Units Without Reservoir," revised June 1988. Influent challenge waters for the chlorine reduction evaluation were prepared with an influent free available chlorine (FAC) target spike level of 2.0 mg/L (2.0 ppm).

Influent and effluent samples were analyzed for chlorine using Standard Method for the Examination of Water and Wastewater, 18th Edition, Method Number 4500CL F which is a DPD titration method. The corresponding Method Detection Limit (MDL) and Target Spike Level for this analyte are provided in Table 1.

Analyte Selection for Contaminant Reduction Studies

Table 1
Analyte Standard
Method
Method
Detection
Limit (mg/L)
EPA MCL
Level
(mg/L)
Target
Spike Level
(mg/L)
Chlorine 4500CL F 0.01 N/A 2.0

Experimental Design

The experimental and mechanical system design for the chlorine reduction evaluation was based on test protocol contained in NSF Standard Number 42. This design allows for the uninterrupted testing of two identical units simultaneously. A mechanical test system plumbed entirely of Teflon was used for this experiment. The use orf Teflon provides a chemically inert system which eliminates any corrosion or leaching of system components which may add unwanted contaminants to the challenge test water. All influent samples were taken immediately prior to the test units to demonstrate that the mechanical test system had no effect on the water characteristics or on the concentration or' the challenge analyre.

Test units were installed, conditioned and operated according to the manufacture's instructions. Pressure gauges and flow meters were installed appropriately to allow documentation of system operation. Spiked challenge water was prepared in 525 gallon lots by adding known volumes of sodium hypochlorite to attain an influent target spike level of 2.0 mg/L FAC. A total of 600 gallons of spiked challenge water was passed through each test unit using an operating cycle of 50 percent on, 50 percent off with a 15 minute cycle during periods of system operation which did not exceed more than 16 hours per day. The initial flow rate from each unit was measured at approximately 0.5 GPM using a constant inlet static pressure of 60 PSIG.

Table 2 provides a summary of the system operation and sampling sequence for the Doulton HIP undercounter drinking water treatment system with Ultracarb. Characteristics of the influent challenge water (control) and combined effluent from the two test units at the start-up of the test and at 100 percent of capacity are presented in Table 3.

Table 2 Sample and Analyze

Comments

Percent of
Capacity
Volume Influent
Gallons
Influent Effluent
Initial 10 Unit Volumes X X Start System
10 60 X X .
20 120 X X .
30 180 X X .
40 240 X X .
50 300 X X .
60 360 X X .
70 420 X X .
80 480 X X .
90 540 X X .
100 600 X X End Test

Note: Refer to NSF Standard 42. Appendix B, pages B5 and B6 for specific test protocol details.

Table 3 Influent and Effluent Water Characteristics
Parameter Influent
Control
Start-up
Combined
Effluent
Start-up
Influent
Control
100% Capacity
Combined
Effluent
100% Capacity
pH 6.3 6.5 6.3 6.2
TDS 230mg/L 285mg/L 265mg/L 273mg/L
Temperature 24C 23C 22C 21C
Turbidity 0.2 NTU 0.2 NTU 0.2 NTU 0.3 NTU

Chlorine Reduction Results

The results of laboratory analysis for the chlorine reduction evaluation are summarized in Tables 4 and 5. The influent data depict the reproducibility of the spiking level and analytical methodology for this analyre. Analyre data points which were below the MDL are labeled with a less than sign "<" and the actual MDL. Effluent chlorine levels less than 0.09 mg/L, were observed in all samples collected from the two identical test units up until the time testing was discontinued at 600 gallons. The percent contaminant reduction was calculated for each of the influent/effluent pairs and is tabulated in Tables 4 and 5. Where effluent chlorine levels were below the MDL, the MDL was used to calculate the reduction percentage. These values are simply given as a greater than sign ">" and the actual calculated percentage.

Table 4 Test Unit 1

Chlorine Reduction Studies with Ultracarb

Volume
Influent
Gallons
Influent
Sample
Number
Influent
Lead Level
mg/L
Effluent
Sample
Number
Effluent
Lead Level
mg/L
Percent
Reduction
Flow
Rate
(gpm)
Initial 9312046742 1.96 9312046743 <0.01 >99 0.50
60 9312046745 2.24 9312046746 <0.01 >99 0.55
120 9312046748 2.14 9312046749 <0.01 >99 0.57
180 9312046751 1.96 9312046752 <0.01 >99 0.58
240 9312046754 1.97 9312046755 0.08 96 0.55
300 9312046757 1.91 9312046758 0.02 99 0.55
360 9312046760 1.93 9312046761 0.05 97 0.55
420 9312046763 1.93 9312046764 0.01 99 0.56
480 9312046766 1.94 9312046767 0.03 98 0.55
540 9312046769 1.87 9312046770 0.06 97 0.55
600 9312046772 1.87 9312046773 0.03 98 0.55
Table 5 Test Unit 2
Initial 9312046742 1.96 9312046744 <0.01 >99 0.48
60 9312046745 2.24 9312046747 <0.01 >99 0.40
120 9312046748 2.14 9312046750 0.02 99 0.45
180 9312046751 1.96 9312046753 0.08 96 0.44
240 9312046754 1.97 9312046756 0.04 98 0.45
300 9312046757 1.91 9312046759 0.07 96 0.45
360 9312046760 1.93 9312046762 0.04 98 0.40
420 9312046763 1.93 9312046765 0.03 98 0.50
480 9312046766 1.94 9312046768 0.02 99 0.45
540 9312046769 1.87 9312046771 0.06 97 0.45
600 9312046772 1.87 9312046774 0.06 97 0.40

Conclusion

The Doulton IP100UC undercounter drinking water treatment system containing an Ultracarb filter cartridge was found to be very effective at removing chlorine from spiked challenge water. Calculated contaminant reduction percentages were greater than 95 percent in both test units evaluated for 600 gallons, which substantially exceeds the current NSF requirement of 75 percent minimum reduction for Class I filters. Based on this set of laboratory results, the Doulton HIP undercounter drinking water treatment system meets the requirements for compliance under NSF Standard Number 42 for taste, odor and chlorine reduction for Class I filters using a capacity rating of 600 gallons.

Chlorine Reduction Results

Live cysts test at University of Arizona US   Live cysts test at Water Research Council (WRc) UK   E.coli test   NSF standard 42 particulate US   NSF standard 53 turbidity US   NSF standard 53 lead US   Salmonella typhi, shigella dysenteriae and vibrio cholerae Inaba bacteria test UK   Pesticides and herbicides test UK   E.coli, heavy metals and THM's test Hong Kong   Serratia marcescens and escherichia coli bacteria test UK

*ANSI/NSF Standard 42, Drinking Water Treatment Units–Aesthetic Effects
**ANSI/NSF Standard 53, Drinking Water Treatment Units–Health Effects


User's Guide   Residential Drinking Water Systems   Portable Gravity Fed Units   Boats/RV's Fresh Water Systems   Whole House Water Filtration/Conditioning Systems   Commercial Kitchens Equipment   Industrial Grade Water Purification Systems   Filter Replacement Ceramic Candles and Cartridges   Faucets for Water Filter   Site Plan   ALL PRODUCTS LIST