No i dont think it will ever have enough pressure to spray. Maybe if it's pretty high, with a full 15 gallons it might have enough pressure to wash off the deck. Water from rain barrels is best used to water plants, it's much better for them than city water. It won't even come out a soaker hose, there just isn't enough pressure. I made my own soaker hoses by drilling holes in a regular water hose so it was easier for the water to leak out the hose. It works well in the garden.
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Gayle
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