So I am not using even close to twice as much of reagent A as I am B and C. I recently setup the trident and haven't had to replace any of the reagents yet, but I suspect when I need to replace B and C the second bottle of A will be about 3/4 full. What do you guys who have been using a trident for a long time do when this happens. Do you go ahead and replace all 3 just throwing away the left over A, or can I just do a reset on bottles B and C?