The equivalent amount of oxidizing power as 1 ppm FC when added as MPS (6.7 ounces weight per 10,000 gallons) has the same acid effect (after usage/consumption) as 2.5 ounces of full-strength Muriatic Acid (31.45% Hydrochloric Acid) per 10,000 gallons. It's actually somewhat more acidic for equivalent FC than Trichlor.