we dug a pond last summer. I want to make a skateing rink on it. it was iceing up about an inch thick then it snowed. i went out to shovel it and it seems to be all slush under the snow now. what gives? warm water melting it from under side maybe? maybe i should just spray it with water to finsish melting the snow. it's in the 20's here and i would think it would freeze if the snow wasn't insulating it.