Aluminum N° 1 + N° 2 Reagent Tablets (50) – for Pool PhotometersAluminum N 1 + N 2 Reagent Tablets (100) are photometer compatible replacement refill reagent tablets used for accurate pool & spa testing. Key Specs Product type: Replacement refill reagent tablets (consumable) Test parameter: Aluminium Format: Tablet reagent (50 tablets) Shelf life: 2 years (sealed, stored properly) What this reagent does Ensure quality in pool water with the PoolWaterLAB Water Tester Aluminium N 1 + Aluminium N 2 100 Tablets. This