I use baking soda as well. I put some right after my waterfall in the stream area. I only put a little in at a time and check it later on in the day to make sure I am not adding too much. I have a hot tub too and using baking soda there has helped save me money!
I was also told by a woman at a local pet store that baking soda will increase the hardness of the water but I am not 100% sure if that is true. She said that Koi and goldfish like medium hard water.
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