VEVOR Tree Watering Rings, 4 Pcs 20 Gallons Tree Watering Bags, 6-9 Hours Slow Release, Refillable Planting Water Bags, Water Saving, Heavy Duty Watering System for Shrub Tree Root Drip Irrigation

Refill about every 3–7 days depending on heat, tree size, and soil moisture, allowing the bag to fully drain before refilling.

Dear customer, No, that’s not what the instruction means. It does NOT require you to remove the bag after every watering. The phrase “when not in use” refers to long periods of non‑use (such as days/weeks without watering, or over winter). You can leave the bag on the tree all summer for continuous watering. Only when you will not use it for a long time should you empty leftover water, remove the bag, dry it, and store it in a cool, dry place.