I loaded last night at 8pm,spread some,and got up this morning at 4am, to spread more,it was around 5 degrees this morning,the treated salt didnt freeze overnight,came right out of the V pro this morning.I havent had any freezing issues at all,as long as i cover the spreader.I like to always have some salt in the truck,for 2 reasons, If i need a little, I have it,no need to go back to the shop ,and my spreader is only 400 lbs,I like to have at least 1000 lbs in the bed at all times to counteract the 1000 lb blizzard plow,and for traction.IMO,you got to get treated salt if you want to be able to leave it in the hopper.