At the heart of our filter system is the Sterasyl® ceramic. The ceramic is impregnated with silver to inhibit the growth of bacteria. Sterasyl® ceramics have a tightly controlled complex pore structure, which has unparalleled filtration properties. Sterasyl™ is effective in both gravity and pressure filters. With its Absolute filtration rating (defined as >99.99%) of 0.9 microns, Sterasyl® is highly effective against particulate contamination, pathogenic bacteria, cysts etc.
The Sterasyl® ceramic is filled with granular activated carbon to produce the Super Sterasyl™ filter element. Among other things, activated carbon is very effective at removing chlorine, fluoride and organics from water. Super Sterasyl® uses granular activated carbon instead of an activated carbon block in order to give superior flow rates in a gravity filter.
Each filter system includes two Doulton Super Sterasyl® filters. Each of these is rated for 2000 gallons for a total lifetime use of 4000 gallons before you have to replace the filters, depending on your water quality.