Plant a market umbrella firmly on the deck with a 22 inch fillable umbrella base stand built around a large sand or water reservoir. A rust-resistant outer shell shrugs off morning dew, and a wide footprint distributes the load across the patio so the umbrella stays upright in gusty afternoons. A central locking knob secures the pole, while a sturdy grab handle helps two hands relocate the base between deck corners as the sun crosses the patio.