First of all, the MSDS for this product shows Citric Acid, CAS # 77-92-9, 0.5 - 1.5 %. I know Citric Acid is a stain remover, but does it also bond to metals, or is this a mistake in the MSDS?
Secondly, in the FAQ section it states -
"It is important to use a non-polymer filter aid with sand and cartridge filters while removing metals because metal particles are so extremely tiny that they can slip through the sand and cartridges and return to your pool water. The use of a filter aid traps the metal particles until the filter is backwashed or cleaned out."
So, if I'm understanding the literature, this product will either bond to metal, or release it from the surface it's staining, and then the metal will be trapped in the filter (in the case of sand or cartridge, if you use a "non-polymer filter aid") and then can be backwashed (DE or sand) or cleaned (cartridge) from the filter.
Doesn't this mean that the metal will be permanently removed from the water? I thought this couldn't be done (CUlator maybe, maybe not), and that the metal could only be bonded to something, but would still be in the water?