I've been reading about phosphate removers, orthophosphates, HEDP metal sequestrants, and have found some good posts on TFP. One question I have, though, is whether the form of phosphates found in a spa pH buffer would be removed by a phosphate remover such as lanthanum. I figured there would be a previous post about it but haven't stumbled across it.
I'm just doing a little self-education exercise. It never hurts to learn more, unless you learn that you aren't just paranoid, they really ARE out to get you.