EPA accepted Each capsule contains specialized microbial cultures for use in a broad range of areas involving degradation of industrial and municipal waste To use, mix capsule contents with 0.5L of APHA standard dilution water at 20°C (68°F), stir for at least 60 minutes Mixture yields seed inoculum for up to 200 BOD tests For best results, use within one year of purchase Also available as Polyseed-NX , which contains an approved chemical additive for the inhibition of ammonia nitrogen (NH 3 -N) in wastewater samples for CBOD analysis Order Info Supplied as a bottle of 50 capsules.