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|FINAL REPORT -Spectrum Labs Inc.
DOULTON UNDERCOUNTER DRINKING WATER SYSTEM WITH SINGLE ULTRACARB CERAMIC CANDLE
Class 1 and Absolute Particulate Reduction
Report Number - 0561D-020794 - revision 1
The experimental and mechanical system design for the Class I particulate reduction evaluation was based on the test protocol contained in NSF Standard Number 42 and the absolute particulate reduction evaluation was based on ASTM F795. Both designs allow for the uninterrupted testing of two identical units simultaneously.
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 of the challenge analyte. Pressure gauges and flow meters were installed appropriately to allow documentation of system operation.
Test units were installed, conditioned and operated according to the manufacturer's instructions. Prior to spiking the challenge water, background influent and effluent samples were collected until samples obtained a steady state condition. Samples for the Class I particulate reduction evaluation were collected at the start of the initial cycle, at the start of the fourth cycle and when the unit reaches 75 percent reduction in flow or when the pressure drop across the unit reaches 40 PSIG. Spiked challenge water was passed through each test unit using an operating cycle of 50 percent on, 50 percent off with a 3 minute cycle, 16 hours per day, followed by an 8 hour rest period under pressure. Samples were collected for each test at the beginning of the "on" cycle immediately following the passage of one unit volume. Samples of influent and effluent water from the absolute particulate reduction evaluation were collected within 30 seconds after starting the injection of challenge water.
Particulate Reduction Results
The results of laboratory analysis for the Class I particulate reduction evaluation are summarized in Table 2. Table 3 summarizes the results for the absolute particulate reduction evaluation. The influent and effluent results for each sample point are tabulated along with the percent reduction. Both units evaluated meet the current NSF acceptance levels of at least 85 percent particulate reduction for a Class I filter rating.
Results from Particulate Reduction Studies for the Doulton Under counter Drinking Water System with Ultracarb candle
Instrumentation: HIAC/Royco 8000A Counter, LD400 Sensor
Results from Absolute Particulate Reduction Studies for the Doulton Under counter Drinking Water System with Ultracarb
Instrumentation: HIAC/Royco 4200 Counter, LAS 346 Sensor
The Doulton HIP undercounter drinking water treatment system containing an Ultracarb filter cartridge was found to be very effective at removing particles from spiked challenge water. Calculated particulate reduction percentages were 99.0 percent or greater in both test units. This substantially exceeds the current NSF International Standard Number 42, Appendix C acceptance level for a Class I particulate reduction claim of a minimum 85 percent removal of particles in the 0.5-1.0 micron size range.
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