diatomaceous earth filter
diatomite filter

Other common filtration processes including slow sand filters, diatomaceous earth filter, and membranes will remove 99% of Cryptosporidium.

In most areas cartridge filters are less expensive than diatomaceous earth filters but cost more than sand filters.

Diatomaceous earth filters are backwashed according to the proprietary arrangement of pumps, valves and filters associated with the filtration system.

Diatomaceous earth filters use granules composed of the skeletal remains of fossilized marine life, frequently referred to as diatoms, to clean the water.

This puts fresh material near the septa (the filter screen), so these filters do not have to be changed as often as the conventional diatomaceous earth filters.