I have recently started using Fiber Clear instead of DE in my filter and I am very pleased with the improved clarity of the water. However, we have an ongoing iron problem and have used metal Sequestrants to keep it somewhat under control. I notice on the Fiber Clear package that it warns against using Sequestrants. I am wondering if this would apply to metal Sequestrants as well as to coagulant style clarifying Sequestrants? I have tried to contact Fiber Clear with this question, but they are not getting back to me.