What is the coverage area of the Aqua Joe AJ-IST39BM? The Aqua Joe AJ-IST39BM covers a maximum area of 1390 sq ft. Related articles What is the coverage area of the Aqua Joe AJ-ISSS? How do I use the All-Season Multi-Purpose Spreader? How can I modify the spray distance and coverage? Does the Aqua Joe PRO Fiberjacket Hose offer protection from UV Rays? Why does the pressure vary from high to low?