It's 7-3/4 boxes (76 ounces weight each) of 20 Mule Team Borax per 10,000 gallons for 50 ppm Borates. To balance the pH, this requires 282 fluid ounces (35-1/4 cups or 2.2 gallons) of full-strength Muriatic Acid (31.45% Hydrochloric Acid). You usually alternate adding back and forth so that you don't have the pH swing too wildly.

I'm glad the feel of the Borates are working out. I think the main effect is a reduction of surface tension and/or a surfactant effect and that may make the hair not stick together as much and the skin feel a little more silky, but quite frankly the effects aren't noticed by everyone and I'm suspicious that some of it isn't just the placebo effect.