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Do phosphate removers (such as Proteam Phosaway) interfere with HEDP sequestrants (Metal Magic). i.e. After Vit C followed by Metal Magic, will Phosaway break ongoing sequestration?

Hoping someone can assist. I have a 30,000 gallon in-ground vinyl salt water pool with recurrent yellow metal stains on pool floor/ walls. Is there any way to check if metals are coming from heater? All pool water goes through heater regardless of use- no way to bypass (I only use heater for spa...