If a mouse or sparrow dies inside a small well and does NOT swell or decay, how many buckets must be drained to purify it?

Well Purification: Moderate Drainage & Unknown Decay Timings

• 10 to 15 buckets.
• 20 buckets (obligatory) up to 30 buckets (recommended).
• Exactly 40 buckets.
• Complete drainage is required.