Does %0.2 EDTA and water at pH 7 need Preservative?
I want to make a Product to make the hard water soft during hair wash. It would be %0.3 or 0.2 EDTA and water at pH around 7. Add a teaspoon of this to some water and rinse the hair with that water.
Does this product (%0.2-0.3 EDTA and water at pH 7 need Preservative?
Any thoughts on such product?