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|FINAL REPORT -Spectrum Labs Inc.
DOULTON UNDERCOUNTER DRINKING WATER SYSTEM WITH SINGLE ULTRACARB CERAMIC CANDLE
Report Number - 0561AU-010694 - revision 1
To: Mr. Anthony Frost, Doulton Water Care, Filleybrooks, Stone, Staffordshire, ST150PU
original signed by:
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
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
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.
Note: Refer to NSF Standard 42. Appendix B, pages B5 and B6 for specific test protocol details.
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.
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*ANSI/NSF Standard 42, Drinking Water Treatment Units–Aesthetic Effects
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