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At the beginning of Shakespeare's Richard III, the king says "Now is the winter of our discontent." He wasn't talking about an unwinterized pressure washer, but he could have been, if he had one. And that's the point. You could be quoting Shakespeare, or worse, if you don't winterize your pressure washing equipment. You see, water will freeze when the temperature drops below 32 degrees F. The teeny-tiny H2O molecules in your power washer expand and crystallize. It is here that the discontent sets in. Ice can cause burst hose lines, hose malfunction, cracked pump heads, pump piston packing damage, and a shortened pump life. You can avoid a winter of discontent by adding antifreeze to the pumping system of your pressure washer. You'll not only protect it from the effects of freezing but also prevent engine parts from corrosion.