Lou, sorry I'm late getting to this. Snake away and moth balls both are distractions, do they work, yes, are they 100% efficient, NO That said, BOTH are dangerous to wildlife like squirrels, rabbits, and such plus dogs and cats so be sure and place under stones of under rocks to avoid animals eating them if you use either. Only way I have found to safely remove a venomous snake is baiting and trapping it. a cheap trap and effective trap is some leaf netting rolled up with a dead fish, or frog wrapped in. Once captured, DO NOT TRY AND RESCUE! The snake gets tangled in the netting and will become extremely aggressive. I do not recommend poking even with a long stick, chances are you won't find it, If you do, the will and do become aggressive and I have seen them swim at someone that would not leave it alone. The good news is most Vipers will avoid human contact or contact with anything predators, They are usually very secretive and if they see a lot of motion will usually move on to a quitter area to hide and hunt. Good luck and be careful. If possible find a safe place and a bright spot light type flask light and watch the edges of the pond at night. If it's there that's when it's most likely to be seen.