I use a product called Asolute Zero driveway de-icer mixed with Epsom Salts. You buy the de-icer in a 50lb bag for around $40 and epsom salts are cheap. Will last you a couple of years. I believe the mixture is 9:1. I add 1/2 cup fer 5G to my top up water. Would be depending on your water volume but thats the amount that works for me.
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