I found EI dosing needed to be altered a lot to keep my phosphate in line. I was getting off the chart also. But I don't think 10 on a 55 will be likely to show much change. It took several major 50% changes to get mine coming down enough to read. Now I'm not dosing phosphate at all but assume it is getting there with food. I'm back down in the 1-2 range and seem somewhat better.