With regards to power service biocide, I just went through my first winter of owning a tractor, and had a bottle of biocide sitting in the garage all winter. I noticed a week or so ago that the liquid had turned to a solid mass. Even though the temperature was in the 50's in the garage, it was solid. I put it outside in the sun for an hour or so and it was now liquid with waxy like particles floating in the liquid. I may have missed something on the bottle, but could find no reference to not exposing it to freezing temps. I have not used any of it yet this season, but I question if it is still usable. Anyone else experience this phenomenon?