Apex Trident Reagent 6-Month Trident Reagent Kit - Neptune SystemsNeptune System's Replacement Reagent Kit comes with everything you need to change out the reagents for the Trident Marine Water Analyzing System. Each kit comes with new bottles that can be placed directly into the Trident's reagent holder and only takes a few minutes to exchange the old for the new. Amount of Tests: Includes three 2 Month Trident Reagent Kits!* Based on the default testing schedule of 4x alkalinity, 2x calcium, and 2x magnesium tests