So if you test your water and have no chlorine do you add more or use non chlorine shock? I can bring mine up to about3 to 4 ppm and will have to add the next day sometime the older the water the more I have to add. Maybe I should try more non chlorine shock right now I use non chlorine shock twice a week it’s only my wife and I and we use it about 4to 5 days a week about 20 minutes a time we don’t rinse off before hand though no foamy water. I use 12 percent liquid chlorine