aluminium

I just got my ICP results back from the icp.reef-zlements kit I sent off a few days back. I have noticed 2 things that im not really sure how to fix. 3.57 µg/l Cobalt When it should be 0.1 - 1 µg/l Thatsvery high? What could cause this? and 122.92 µg/l Aluminium When it should be 0 - 20...