How much alcohol should I mix in with the distilled water to avoid freezing in the winter months?
This depends marginally on which alcohol you are using. The following table shows some values for methanol; ethanol alcohol is similar. Do not run more than a 50% by volume mixture of distilled water and alcohol as it may cause the pump seals to swell. Remember that the temperature of an attached garage will tend to be warmer than the outside temperature. Denatured alcohol can be purchased at most local hardware stores.
