Pool Math app calculation off

Oh, I failed to mention, this is for my bromine sanitized spa. Is dry acid ok then?

I do strictly use muriatic in my pool anyways.
How often do you drain your spa and refill?
 
Usually in the fall before winter, then again in spring and as needed in summer
The sulfates in the dry acid will accumulate in the spa water until you dump it.

It is not good for the SWG or concrete but hard to say if it will get to damaging levels in 6 months.
 

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