Bac water question : r PeptidePathways BAC Water for Peptides All You Need to Know The Peptide Blogger Does your injection sting? That's not normal. A common sign of low quality BAC water is a pH that is too acidic (below 4.5). This doesn't just cause painit can How to Store Bacteriostatic Water Safely Confused about whether BAC water needs refrigeration after opening? According to USP standards and Pfizer's own guidance, both room temp (2025C) and refrigeration are acceptable