Borax And Muriatic Acid

[NewB@Spa]

I am getting prepared for a new fill and instead of Boric Acid (I could not find it this time) I am going with Borax and Muriatic Acid combo. Do I mix it together before I pour it into the tub? I assume I can do this last after everything is balanced?

[david_bilton]

I am getting prepared for a new fill and instead of Boric Acid (I could not find it this time) I am going with Borax and Muriatic Acid combo. Do I mix it together before I pour it into the tub? I assume I can do this last after everything is balanced?

NEVER mix chemicals in the same bucket before adding and always wait before adding more

[Fry Man]

I am getting prepared for a new fill and instead of Boric Acid (I could not find it this time) I am going with Borax and Muriatic Acid combo. Do I mix it together before I pour it into the tub? I assume I can do this last after everything is balanced?

NEVER mix chemicals in the same bucket before adding and always wait before adding more

I do the Borax and Muratic addition after I have corrected the TA to be close to the required setting based on my tub (TA 90). I measure both of the chemicals out into seperate containers and then first add the Borax and then add the Muratic acid to the water. I do not think the order is critical as both products go in close together. I let the water circulate on high and after 30 to 45 minutes do a ph test to see if the ph is still in range. The pool calculator is good and the amounts balance out. My water volume (1131 L) required 500 gms of Borax and 250 ml of muratic acid to have 50 ppm of Borate in the water. I did this in three steps of 200, 200 and 100 gms of Borax. You can use whatever steps you prefer. When I was done with this I went back and fine tuned the TA to the setting I wanted (70-80). I then used Dichlor to build up CYA to 30 ppm. Minor PH corrections will fine tune the TA after this.