Has anyone soaped with Sodium Gluconate? I usually use Tetrasodium EDTA but decided to add in some SG in soap for my daughter. She nows lives in an area with extremely hard well water. She tells me her hair is a mess and so is her skin. I actually used it in 3 batches and all accelerated, forth batch with only EDTA did not. Of course it could have been the fo's that were new ones. Just curious if any of you have tried it.