It looks like I’ll be taking over the testing of water on the old tank. The one problem is that; 1. I’ve never done it before, and 2. The instructions for the tests kits have long been pitched. Not a problem with all the tests except Calcium and Kh. So what I need are the conversions of drops to mg/l and ppm, respectively. Could someone help me out? The API website does not include these instructions. Thanks.