I thought I would try out this professional water chemistry test service. I think the results are hit or miss. It shows my calcium and K being low. I tested the water I sent to them with my own kits. I came up with 430 calcium and K around 350 to 400. I also had a magnesium of around 1500. I just got done doing a hyper saturation of Kent tech m to kill some bryopsis. All the other test where were I assumed they would be.