Whatman has introduced a new, convenient method for the concentration and recovery of waterborne protozoan cysts and oocysts. Approved by the USEPA for Method 1623, Cryptosporidium and Giardia in Water by Filtration, the CrypTest Membrane Filter Cartridge is highly efficient, easy to use and convenient for field sampling. It captures protozoan cysts and oocysts from sample water pumped through a disposable cartridge contained in a reusable housing.