Just to echo what WaterBear said . . . it's an old ploy in the pool industry, to dig up the most obscure legally-permitted chemical name for their products they can find, in order to pull the wool over their customer's eyes.
Thus sodium bicarbonate (baking soda) becomes "sodium hydrogen carbonate" or "sodium acid carbonate", and so on.
It often ends up confusing pool dealers as well. I've had a pool dealer argue vehemently (and sincerely, I believe) that their BioLab "sodium hydrogen carbonate" was much better for pools than baking soda!
Ben
"PoolDoc"
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