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I have a salt water pool and I use well water to fill my pool. My hardness level is 280. but I would still like to know what type of iron or other metals I might have in the pool. Looking for an accurate way to test for which metals I am high in

I have a 12,000 gallon salt watered generated pool. I keep my LSI in my CSI balance My hardness level is 280. I'm wondering if I need to keep adding my sequestering agent to my pool with that hardness level. I was at 450 I drained my pool and added water to it to reduce it to 280 it's an...