AquaChek Orange 561682A Swimming Pool Spa Monopersulfate 3-in-1 Test Strips - 50 Color: Orange, Model: , Home & Garden Store 50) New *AquaChek 561682* Orange 3-in-1 Monopersulfate Test Strips Tests for 3 important chemistries in seconds: Potassium Monopersulfate, pH, and Total Alkalinity 50 strips per bottle Instructions and chart on the back of the bottle Takes about 15-30 seconds to show results