TF100 should be fine and the Speedstir really makes testing FC/CC, TA and CH a breeze. Mine is now going on year 4 with the occasion reagent refill...pretty sure I still have my original TA and CH reagents. Should last at least one season or longer, but depends on how often you decide to test. Store the kit at room temperature, out of direct sunlight. We keep our's in the kitchen cabinet, next to the slider leading to the yard :thumbs up: