Soil applications may be more practical between rows of fruiting vegetables such as tomatoes, beans, peppers and eggplant where you can keep the water off the plant and edible parts. The filtering action of a mulch layer in the rows will also help. Storage of the grey water has its particular problems and may be restricted, so check to be sure. By law, grey water must not run off your property and cannot be sprayed into the air. With these limitations, a trickle system will apply the water slowly with no run-off.
Soaker hoses work very well.
Filter the water through a piece of cloth or similar material to prevent clogging the trickle system. Filtering can be accomplished as the water is placed into storage. A cover should also be placed on the storage container for safety reasons. He coordinates all extension horticulture programs. He has bachelor's, master's, and doctoral degrees in ornamental horticulture and has been on the Penn State faculty since 1966.