This Old House plumbing and heating expert Richard Trethewey shows how to reuse laundry wastewater. (See below for tools and a shopping list.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Tools for How to Install a Graywater Irrigation System: - pliers - drill/driver - nut driver - 1-inch-diamond hole saw - PVC tubing cutter Shopping list…