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Doulton Water Filter candles are available in five different grades

Sterasyl® Ceramic

At the heart of every Doulton water filter candle is a 'Sterasyl' silver impregnated ceramic microfilter. Fairey Industrial Ceramics is the worlds leading manufacturer of ceramic materials with closely controlled pore sizes. This expertise gives Doulton candles the highly consistent and controlled pore structure necessary to remove a wide range of water borne contaminants over the life of the filter. The incorporation of silver locked within the ceramic structure, gives each candle enhanced bacteriostatic properties. Silver inhibits the growth of bacteria giving the candles self sterilising properties and removes the need for regular boiling. By incorportaing activated carbon in the form of a fine coating, granular carbon or carbon block, the sterasyl ceramic can also be produced in Super Sterasyl, Carbosyl, and Supercarb grades which combine the advantages of ceramic and carbon filtration within a single filter element. At the top end of the product range the Ultracarb candle has an additional ion exchange media which reduces Lead and other harmful heavy metals.
Candle Grade Sterasyl Silver impregnated ceramic microfilter Super Sterasyl Streasyl microfilter plus Granular activated carbon Carbosyl Activated carbon impregnated cermaic microfilter Supercarb Sterasyl microfilter plus carbon block core Ultracarb Sterasyl microfilter plus carbon block core and heavy metal removal media
FILTRATION RATING (% particulate filtration efficiency) Absolute (defined as >99.99%) 0.9 micron 0.9 micron 0.9 micron 0.9 micron 0.9 micron
Nominal (defined as >99.9%) 0.5 to 0.8 micron 0.5 to 0.8 micron 0.5 to 0.8 micron 0.5 to 0.8 micron 0.5 to 0.8 micron
WORKING PRESSURE (for pressure filter use) Minimum 10p.s.i. 10p.s.i. 10p.s.i. 10p.s.i. 10p.s.i.
Maximum 125p.s.i. 125p.s.i. 125p.s.i. 125p.s.i. 125p.s.i.
WORKING PRARMETERS Working Temperature range 5-38 (°C) 5-38 (°C) 5-38 (°C) 5-38 (°C) 5-38 (°C)
Working ph range 5.5-9.5 5.5-9.5 5.5-9.5 5.5-9.5 5.5-9.5
Suitable for use in gravity filters Yes Yes No No No
Reccommended change frequency 12 months 6 months 6 months 6 months 6 months
FLOW RATE Unrestricted flow at 3 bar pressure Litres per minute 4 4.5 2.5 3.7 3.3
US gallons per minute 1.05 1.2 0.6 1 0.9
To achieve maximum performance Litres per minute N/A 1.5 1.5 1.9 1.9
US gallons per minute N/A 0.4 0.43 0.53 0.5
CAPACITY Before replacement to guarantee performance Litres 10,000 2,000 1,496 3,740 2,244
US gallons 2,600 535 400 1,000 600
QUALITY APPROVALS NSF Approved version available Yes No Yes Yes Yes
WRc Approved Yes Yes Yes Yes Yes
NSF Turbidity Reduction std. 53 >99.69% >99.69% >99.69% >99.69% >99.69%
PATHOGENIC ORGANISMS % Bacteria Removed E.Coli >99.99% >99.99% >99.99% >99.99% >99.99%
Vibrio Cholerae (Cholera) >99.99% >99.99% >99.99% >99.99% >99.99%
Shigella >99.999% >99.999% >99.999% >99.999% >99.999%
Salmonella Typhi (Typhoid) >99.999% >99.999% >99.999% >99.999% >99.999%
Klebsiella Terrigena >99.99% >99.99% >99.99% >99.99% >99.99%
% Cyst Removal Cryptosporidium >99.999% >99.999% >99.999% >99.999% >99.999%
Giardia >99.999% >99.999% >99.999% >99.999% >99.999%
TRACE ORGANICS REMOVAL Insecticides Lindane @ 0.1 ppb presence N/A No Data >80% >85% >85%
Herbicides Atrizine @ 1.2 ppb presence N/A No Data >80% >85% >85%
Phenols TCP @ 150 ppb presence N/A No Data >80% >50 % >50%
Polyaromatic Hydrocarbons PAH's @ 0.2 ppb presence N/A No Data >80% >95% >95%
Trihalomethanes Chloroform @ 150 ppb presence N/A No Data >66% >50% >50%
INORGANICS REMOVAL Free Chlorine Removal 2mg cl/l challenge N/A Under gravity >95% Under pressure >50% >95% NSF Class 1 std. 42 >97% NSF Class 1 std. 42 >97% NSF Class 1 std. 42
Lead Removal @pH 6.5 after 2,244 ltrs N/A N/A N/A N/A 98.3% NSF std. 53
@pH 8.5 after 2,244ltrs N/A N/A N/A N/A 98.3% NSF std. 53
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