Review on 🧪 JTT 9-in-1 Water Test Kit 100ct for Drinking Water, Aquarium, Pool & Spa - Best Kit for Accurate Water Quality Testing with Instant Results: pH, Free Chlorine, Total Hardness, and More by Sherri Lee

I have used them many times but the last batch was defective. It turned out that my tap water, which has a constant pH of 7.0-7.2, was below 6.0. It's easy to think the tank has a pH error when it doesn't, and accidentally make the tank too alkaline, which can kill your fish. I am farming 1 wild extinct species of fish, Monterrey Pied, and I just can't let this happen.