Buffered Peptone Water (BPW), Sterile, Ready to Use Pre Enrichment Media, 400mL Bottle, 20/Case. Offering convenience and reliability, this sterile pre-enrichment media is designed for microbial culture applications. The 400mL bottle size is ideal for larger samples, and it is ready to use, minimizing preparation time. It comes in a 20-case packaging, providing a cost-effective solution for laboratories.