AquaChek MPS 3-in-1 Test Strips Tests for: Monopersulfate (MPS), pH, Total Alkalinity MPS 3-in-1 is designed for pools using a mineral purification system. Monopersulfate is a non-chlorine based oxidizer used in mineral systems or in bromine pools. FIND AN AquaChek RETAILER Product Demos FAQ Product Information Recommended Products Product Information Monopersulfate: Low-High pH: 6.2-8.4 Total Alkalinity: 0-240 ppm Blister card. Monopersulfate, pH and Total Alkalinity. Recommended Products AquaChekSelect Kit AquaChekYellow