I’m not sure if this is the correct place to post it this but here goes. When I opened my pool, I found some old tomato stakes that had blown into pool and I missed it. It left a rust spot in the rust spots or nail spreading. I’m not worried as much about the spots as I am about the amount of metal in the water. Should I buy something to test the metal or simply just use a metal remover? I have never used one before, so I need some advice. Thanks in advance.