Patent ID: 8241687

Claim:
A method for preserving cooking oil in a fryer during deep fat frying which comprises treating the oil while in situ in said fryer during said deep fat frying with an hydraulically set product: consisting essentially of >50 wt % of a milled of a mixture of white OPC clinker and white OPC, and optionally, further ingredients selected from silica 1-2 wt %, titania (TiO 2 ) 1-2 wt %, calcium silicate, magnesium silicate, aluminium silicate, natural feldspars, natural sodium zeolites, natural calcium zeolites, synthetic calcium zeolites, synthetic sodium zeolites, wollastonite, calcium hydroxide, clays, pillared clays, activated clays/earths, talcs/kaolinite, amphiboles, granite porphyry, rhyolite, agalmatolite, porphyry, attapulgite, carbon black, cellulose fibre, diatomaceous earth, antioxidants, flocculants and food compatible organic acids; the product being either a stand-alone block or briquette or being pellets or balls in a treatment cartridge, the product having the properties that calcium and magnesium substantially do not leach into the oil and that it is porous so that oil can diffuse into it and contaminants can be deposited on and within it.