I have 4 huge Iron Curtain filters that are plumbed in before my auto-fill and before my spigots (huge iron content in my well). I also have a TF-100 Pro test kit. Can I buy reagents from the TF website that allow me to test the actual level of iron in my auto-fill? I'd actually like to test the water pre/post the Iron Curtain filters to get hard numbers of how well they are performing. Thoughts?