This HiDip slide is recommended for detection of sulphate reducing organisms from paper pulp & cooling towers waters and petroleum industry. Sulphate API: Medium composition is recommended by APHA for sulphate reducing bacteria. PCA: Plate Count Agar : Recommended for determination of plate counts of microorganisms in food, water, waste water & clinical . Also called as Standard Methods Agar. It is recommended by APHA and FDA for determination of counts