In general, we always recommend using more water than less. Using more water helps to slow down the spraying process and your walk rate, and helps soak the grass and soil. This way you’ll not only have foliage covered, but you'll be allowing some of the nutrients/chemicals to reach the soil and upper roots. This is also a good rule to keep in mind during hot periods. Using more water and slowing down your walk rate while spraying puts down a less concentrated solution, even though the same amount of product is being applied to the same square footage. This helps to avoid over-application or lawn damage. The amount of water used is not as important as how much of the fertilizer is actually getting to the ground.
For example, when applying Super Juiceâ„¢ 14-2-4 on a 12,000 sq ft lawn, add four cups of dry mix to a bucket, then add your water. Because you've mixed-in four cups (enough to provide coverage for 12,000 sq ft), it does not matter if you add one gallon of water or five gallons of water, as long as all of the mixed liquid is applied to the 12,000 square feet.