I had been getting results of 1800+ before I tried this. Without the tips I got in the 1600s on the two tests I ran. It's better, but still higher than the 1300s that my tank is actually at.Do me a favor and redo a test. This time do not use the tip on Reagent A. When Reagent A draws air, you get less of Reagent A in the test pushing the numbers high. Try running a test without this tip, or try running a test using 5 ml of Reagent A. Please let me know how this works for you.