I bought a Hach 5B just to periodically test my water hardness. I know that my GPG is usually around 32. I got the test kit today and tested the water but the water never turned from pink to blue no matter how many drops were administered. The instructions and the process are both extremely simple to do and understand but what am I missing? I did three tests and none of them ever turned blue even at over 60 drops. The water just ended up changing from pink to clear because so many drops were added. Any ideas? I know the kit works because I tested my softened water and it was blue right from the start. Thanks in advance to anyone who can help me understand this.