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I use calcium Chloride (peladow) pellets as a suppliment to my reef tank. Prestone Driveway heat I believe is the same stuff.
It helps corals grow, and also helps out the invertebrates that I have.
I've heard that the calcium actually helps grass, and does not kill off the vegetation.
I'd try not to get the undissolved pellets on the car, as when they hit water it creates a reaction and gets hot.
Not sure if that helps or not.
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