Hach Total Alkalinity Chemkey® Reagents High Range, 200-700 mg/L CaCO3, Box of 25, 8636100By Hach $29.45 | EA Quantity discounts available QuantityPrice Product #: 700108Mfr. Part #: 8636100 This item is in stock Quantity -+ Add to Cart Free Ground Shipping On All Orders Over $1500!*Conditions Apply* Details Description High Range Total Alkalinity Chemkeys, range 200 - 700 mg/L CaCO3. For SL1000 Portable Parallel Analyzer (PPA). Box of 25. DetailsBackDescription High Range Total Alkalinity Chemkeys, range 200 - 700 mg/L CaCO3. For SL1000 Portable Parallel Analyzer (PPA). Box of 25.