The RV antifreeze is not toxic and you have to treat the entire system, not just pour it into the livewells and let it drain out. This is what I do for my Pro-V. Supplies; 2 gallons RV antifreeze, a long flexable funnel, 2- 5 gallon buckets and one good friend. Crank the trailer jack as far down as possible. Make sure boat power is on and livewell drain plugs are in place. Place a bucket under the rear livewell drain. Place funnel in drain hole flexing it upward and held in place by friend. Put livewell control switch into the “Fill” position. Pour 1 gal. of AF into the funnel. When done, remove funnel and put switch inot the “Recycle” position. Let it recycle 2 or 3 times. Have friend hold bucket under the rear livewell drain hole. Put switch into the “Empty” position to empty into bucket. Repeat same procedure for front livewell using the 2nd gallon and any AF that has drained or slopped over into the buckets. When I’m done I shut the power off on my boat, put both switches into the “Recycle” position and clean them with soap, water and vinegar, then pull both drain plugs and hose down. When empty, I put switches back into “Empty” position for winter storage.