Hi I’ve just changed all my test kits to salfert and when testing alk when it changes colour what is left in the syringe you compare how many ml you have left in the syringe and then look at the chart to tell you what your Alk is . I have 1and half ml which says on the chart 15.3 . Am I doing this test correct. Also you will of covered this but if I was to increase Alk can I use baking soda I don’t know much about the use of it . Thanks everyone nman