snow is like 90% air. vrs ice thats 90% water. so mileage variesjw; I don't think it would matter much as the same snow being shoved in is the same snow that fell on the pond in the first place, and melts into it. And I think I read Meyer mentioning that rain (and the acidification thereof on its way down) does little to alter a pond, based on volume alone. Now, if the shoveling included things that were actually ON the patio and shoveled with it, that might affect. I'm thinking if you used any sort of ice melt, that residue might be transferred and cause a ripple (or more).