Ceramic filtration would certainly be suitable for RO desalination plant pretreatment. However, they do not offer any major advantages for seawater pretreatment as compared to standard plastic membranes used at present and are usually close to two times more expensive. Therefore at this time there are no full-scale applications with ceramic membranes for seawater pretreatment. Such membranes have clear advantages in food industry and there they have found much wider application.
I have invented a natural sintered red clay filtration media (Known as TERAFIL) few years back under CSIR lab, Government of India. It is a porous terracotta disc. TERAFIL is getting fast popularity in India, especially for removal of turbid materials, dissolved iron, lime etc and microorganisms, whose size is more than 200 nm. I am sure; TERAFIL can stand saline water easily without decay or any reaction unlike other membranes. It will be very cheap, long lasting, maintenance free and a natural product for pre-treatment for desalination by RO.