I bought two e coli home test kits and followed instructions exactly. Kits were identical. The iQ Bac test kit went a little darker, maybe more sensitive? This was on the north end Bacteriostatic Water (Bac Water) 10ML SSP Research Reconstitution Solution for Laboratory Use Bacteriostatic Water Suppliers: Sterile Water, Syringes & More Bacteriostaticwater.com
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