What is the coverage area of the Aqua Joe AJ-OSPR20? The Aqua Joe AJ-OSPR20 covers a maximum area of 4250 sq ft. Related articles Does the AJ-OSPR20 work with my garden hose? How do I adjust the spray and coverage for my AJ-OSPR20? What is the coverage area of the Aqua Joe SJI-OMS20? What is the coverage area of the Aqua Joe AJ-IS6WB? How can I modify the spray distance and coverage?