20X SSC pH 7.0 (3.0 M Sodium Chloride, 0.3 M Sodium Citrate, pH 7.0) DEPC Treated is a concentrated stock solution and should be diluted appropriately with distilled, deionized water or equivalent to its final working concentration. 20X SSC pH 7.0 (3.0 M Sodium Chloride, 0.3 M Sodium Citrate, pH 7.0) DEPC Treated contains 3.0 M Sodium Chloride, 0.3 M Sodium Citrate adjusted to pH 7.0. Meticulously prepared using ultra pure reagents dissolved in highly polished pharmaceutical grade deionized water treated with diethyl pyrocarbonate (DEPC).