2nd Step

If both of the first two potential causes of odd colors are ruled out, you next need to check for metals in your spa water. Your local spa dealer likely has a test for metals. If you have metals in your water, the solution is a metal sequestering agent, also likely available from your spa dealer. These sequestering agents don’t actually remove the metals. They render them chemically inert so that they do not cause problems maintaining your spa water.