These are effective against bacteria, parasites, and sediments. Some models can filter down to .9 of a micron absolute.
The filter has a hollow core of ceramic which can be scrubbed with a soft bush or scotchbrite when cleaning becomes necessary. This type of ceramic filter can be used as a sediment pre filter in replacement of a standard string wound, foam (poly spun) or pleated filter.
Some ceramic filters are fitted with an additional activated carbon block core to increase their taste and odour reduction efficiency.