The Trident automated testing system requires Reagent A changed every month, while Reagents B and C every 2 months. Noting the hobbyists` concerns of recurring costs for the test kit or automated system the Trident design team at Neptune Systems have tried keeping those costs as low as possible, being approximately 9¢ per test!
When using Trident`s default testing schedule of four (4) alkalinity, two (2) calcium, and two (2) magnesium tests a day, each kit comes in a 2-month supply of reagents. This 2-month supply of reagents kit measures up to at least 240 alkalinity tests and 120 tests each of Calcium and Magnesium.
Neptune Systems recommends keeping on hand no more Trident reagent than you might expect to consume within the next 12 months.