I have been testing my alkalinity levels with Salifert test kits. So far they have been very accurate in readings. But for the past 3 days I've been testing my water and it shows that there is absolutley NO alkalinity in it, which is impossible because I have been adding AquaPhilic Alkalinity Part A. I keep adding and adding and it still does not show up on the tests. I can pretty much say that I've added about 210 ml of it to a 20 gallon tank with sump. What is wrong? Do I need to add more? Something is not right. 8O