Amazon.com : AquaVial | Water Test Kit | Detect
AquaVial Well Water Test and AquaVial E coli and Coliform Water Test kit both use proprietary dyes used to detect the presence of enzyme specific to coliform bacteria - Beta Galactosidase. The enzyme, when present in large enough quantities ( i.e. produced by a live bacteria)- will change the color of the dye from bright yellow to bright purple.
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