Just make sure that the ph is down at about 7 when you shock. If you see any stains forming - add more metal magic. I know that you don't want the water to cloud - but when it clears, which shouldn't take more than a day or two, then there won't be any stains, I know it's a real pain You may be surprised not to get any staining this time - let me know. I was surprised this year after using the metal magic not to get any staining when I took the chlorine up to 20 Please let me know how you do.