I've used the magflake, bought mine from Southern States, and Epsom Salts, available at any drug store, to make the magnesium additive and have had no issues with it at all over the more expensive Magnesium additives from BRS. If you want some magflake to give it a try I can spare some since the bag I bought was more than a 5 gallon bucket full. For the calcium additive, I have mixed the Prestone Driveway Heat up in a gallon jug, have not noticed the jug turning brown or any issues with it at all. Was unable to find the dowflake or Peladow last winter. Have used the soda ash from BRS for alk since I don't want to go to the trouble of baking the baking soda, just easier to buy it.