In a lot of pool glossary's they say the same thing. Some definitions of sequestering agents say they bind onto the metals to keep them in suspension, and some of the chelators say the same thing. Some of the sequesterers say they will bind with the metals and filter out, some of the chelators say the same thing. Ascorbic acid is supposed to be a chelator, but you have to put in a sequesterer to bind onto the metals once they go back into solutions so that they don't precipitate out again. I have used Metal Free (supposed to be a chelator), Sequasol (supposed to be a sequester), and the directions are the same on both. I have also used Jack's Magic. I just used Metal Magic by proteam today, since we had a lot of rain, and I had to shock the pool. So far they all seem to work the same. Metal Magic is supposed to turn the metals into salts so that they can be filtered out. I let you know if I see any difference.

It is all very confusing , but I think they all seem to work the same . Maybe Waterbear or Chem Geek will chime in and give us the chemical difference.