Doulton Ultra Sterasyl Filter from a pot almost totally

from a pot almost totally covered in crystals to one with sparse crystals

with a wide variety of shapes and sizes from the microcrystal

Blue Glaze with Copper and Gold

The Crystalline Glazes

The most extreme variation is in the nickel crystal

Doulton Ultra Sterasyl Filter from a pot almost totallyLink to fact sheet here. DOULTON ULTRA STERASYL (does not remove fluoride) The 9 month or 2000 litre super sterasyl filter manufactured by Fairey Industries in the UK (Doulton) is far and the way the best gravity filter manufactured anywhere. With its Absolute filtration rating (defined as >99. 99%) of 0. 9 microns, this filter is highly effective against particulate contamination, pathogenic bacteria, cysts, giardia, cryptosporidium as well as