From what I'm understanding, anyone who needs the sequestrant has to use it before chlorinating. Adding the chlorine just has to be done slowly, so as not to take the metals back out of suspension. You also have to use sequestrant any time you need to shock, then raising your chlorine slowly again. I've not been past the chlorinating stage, so I don't know about maintenance dosing with sequestrants. You may be best off starting a new thread, so the metals expert, Marie (Mbar) can read it and advise you best. She's dealt with metals in her pool for 10 years and offers a lot of guidance and support through the process.