Not a silly question at all. In fact it is a very good question!
NOT a good idea to pour your test water with reagents back into the pool. You really don't want to be swimming in them. I pour mine down the utiltiy sink and run the water to dilute any reagents. I am on a septic system but I don't feel the tiny amount of chemicals will have any effect. For comparison, if you color your hair at home and wash it off in the shower you are putting a LOT more chemicals down the drain (and some of that might be DPD and related phenylendiames); or look at the ingredients in such household products as toilet bowl cleaner and such. FAR larger amounts of those chemicals go down the drain every day then the tiny amounts in the water from your test kit vials.
IMHO, pour it down the sink!
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