For the isolation and cultivation of fungi and the neutralization of disinfectants. Germicidal or disinfectant residue is neutralized by the addition of lecithin and Tween® 80. Neutralization of these residues reduces their inhibitory effect which would ultimately result in the lowering of the microbial count. W71 is a standard size (15X100mm) passive settling plate for air monitoring of bacteria or fungi. Ideal for environmental monitoring in a clean room or clean bench setting.

Quaternary ammonia compounds are neutralized by lecithin while phenolic disinfectants and hexachlorophene are neutralized by Tween® 80. Together, lecithin and Tween® 80 neutralize ethanol.