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I use 2 oz every other week. That is the same as 4 TBSP. Bottle says 2 oz for tubs up to 500 gal, so that is what i do.
I have been shocking my tub once a week, just as the instructions say on the bottle of "Renew". they say to add 2 oz. of this to the tub. this seems a bit high as I read that others here only add tablespoons of this. also, I have to wonder if it's best to shock the tub when the chlorine level is low (around 1) or to do it when the chlorine reading is high (3-5 ppm). Anyone have preferences on this?-Slappy
Renew is a buffered non chlorine shock meaning it is pH neutral. You will use approximately twice the amount of buffered shock than non buffered shock. I find it much more economical to use a non buffered shock and add baking soda or spa up, which is relatively inexpensive, when I need it.
It might be cheaper but I think once you add the other chems to bring ph back up you'll have added almost an equal amount of stuff to your water.
I have been shocking my tub once a week, just as the instructions say on the bottle of "Renew". they say to add 2 oz. of this to the tub. this seems a bit high -Slappy