How many gallons is your hot tub.? It is safe to use muriatic acid but you will be dosing by teaspoons, tablespoons, and ounces and it is very easy to overshoot. Dry acid is easier to measure for the small volumes of water in a hot tub. Procedure is the same as for a pool. Lower the pH to about 7.0 then aereate to decrease TA! The air jets and bubblers (if you have them) make efficient aeration very easy! Here is the thread that explains it
http://www.poolforum.com/pf2/showthread.php?t=191
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