About 6 years ago I stumbled onto this website and learned a lot of good info. Unfortunately for me I haven't been able to access here for a while but have since bought a hot tub.

Here's the confusion: here we adjust the PH first (I least from what I remember) and for hot tubs they have you adjust the alkalinity first. When I use baking soda in my pool the PH doesn't go up as much as it does in the tub. In the pool I need to use borax to get the PH up but in the tub I get to 7.6 easily.

All logic (for me) says that I am using proportionate amounts of baking soda to achieve an alk reading of say 100. Where we use pounds in a pool I use ounces in a tub.

My questions - Why the difference in technique in balancing water between the different industries and why does it seem that baking soda is more "efficient" in a smaller volume.

Thanks!

Vinny