the trick to using bleach in your hot tub is that you have to add just little each day or right after you use it. For a large 6 person HT, it takes only slightly less than an ounce.

Yes most of the Cl will be reduced by the next day, but the water is sanitized and will be ready for use and then you start over with another dose for the next day. Once a week you can shock with a 10X dose of bleach.

It is not a matter of saving money. I much prefer the use of Cl over Br in my HT. The water is always crystal clear and does not smell or foam as with Br. And I have been having much better control of mildew on the inside of the lid also. The borax and bicarb also help with the feel of the water.

Just my opinion.