Super Tech RV & Marine Antifreeze Safe Odorless Formula for Potable Water 1 Gallon

This works well for homes also. I leave for extended periods of time, and it's not the cold I worry about, but the heat - during the summer, the water in my p-traps for the sinks, tubs, toilets, and washing machine will dry out. This allows sewer gas to back up in my house unless someone is flushing the lines with water to replace that that dries out. Using this product prevents evaporation, and as such, I now no longer come home to my home smelling like sewer gas. Simply pouring it down the drains/in the toilets prevents the issue. The cost, and ability to simply flush the product out of my drains when I start using the plumbing makes it a no-brainer for me.