Acid (Dry or Muriatic) for hot tub - can I use dry for now?

[Farmgal]

I drained and filled my tub yesterday using Ahhsome. I added the initial @ease products.
Now I'm testing the chemicals with my TF100 kit and starting with the TA.
My TA is 240. I have Spapure pH Down which is Sodium Bisulfate.
I was reading that Muriatic acid is better to use than dry. Does it matter?

 

[Texas Splash]

I was reading that Muriatic acid is better to use than dry. Does it matter?

For normal use we recommend the muriatic, but for a short period and to use-up your old stock of dry you should be fine.

 

[Farmgal]

I am a curious person, so I have to ask - why is it better?

 

[mknauss]

Dry acid is sodium bisulfate. After dissociation of the acid salt, it leaves behind the sulfate ion.

Problems sulfates can cause include:

• Sulfates can damage concrete & plaster
• Excess sulfates in water increases the likelihood of corrosion on metal parts
• Excess sulfates in splash out water leads to degradation of any concrete surfaces
• Sulfates degrade the coatings on SWG plates
• At high enough concentrations, sulfates can react with calcium to form spindly, needle-like crystals of calcium sulfate (gypsum)
• While sulfates in vinyl pools is typically not as problematic as in plaster pools, scaling of gypsum crystals can increase the risk of liner puncture.[10]

Sulfates can only be removed by draining water.