When I originally posted this message I never realized all the responses that it would cause. I thought maybe the water purity (such as minerals) in the water can cause its freezing
point to dip below 32F. anyway, the other morning was 21F
and there was no ice at all anywhere on my pond. It tastes great too!
-Shawn
You're correct the addition of ionizing compounds to water will lower the freezing point. One mole of a compound will lower the freezing point -1.86 deg C/mole. A mole is the sum of the atomic weights of the atoms in the compound expressed in grams. For example salt, NaCl has a mole weight of 28 grams (11+17).
28 grams of salt mixed in 1000 grams (1 Liter) will lower the freezing point to -1.86 deg C.
I doubt that your pond has a significant ionic content. When your pond just freezes drop a temperature probe to the bottom and if your still dry, let me know what you get.
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