With a recent freezing rain followed by very cold temp, I had really slick steps and walkway, I didn't think my pet friendly MgCl pellets were helping and tried some old coffee grounds to add traction. I couldn't do this on a large scale but was wondering if this would hurt the lawn. I even had some eggshells I thought about grinding up to add. I normally compost these but if I could use for ice, I would prefer them to salt or sand. Thoughts?