Membrane filters are specially tested for microbiology. 0.45 µm white gridded membranes are tested for coliform, faecal streptococci and serratia marcescens. All 0.65 µm white gridded membranes are tested for complete retention and optimal recovery of faecal coliform and saccharomyces cerevisieae.
Contrasting grid lines allow counting colonies on the filter surface and are tested to assure freedom from grid line inhibition. 3.1 mm squares represent 1/100 of the filtration area of a 47 mm diameter filter (9.6 cm2).
Black and green membranes are also tested for uniform wetting, freedom from grid line inhibition and optimal colour reactions on appropriate test media.
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