Ok Gentlemen
The test strips I purchased from NAPA test for PH, Freeze Protection, and Nitrite. The PH is around 8. Freeze protection is -60 degrees and the nitrite is 0. According to the directions the Nitrite needs liquid S. S. I or DCI-IV additive to recharge the antifreeze. What is this nitrite and what are the additives? And what do they do?