Fill time · 2,500 gal
How long to fill a 2,500 gallon tank
At a typical 8 GPM garden-hose flow: 5 h 12 min. Full table below; exact math is volume ÷ flow.
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| Flow rate | Time | Minutes |
|---|---|---|
| 2 GPM | 20 h 50 min | 1,250.0 min |
| 5 GPM | 8 h 20 min | 500.0 min |
| 8 GPM | 5 h 12 min | 312.5 min |
| 10 GPM | 4 h 10 min | 250.0 min |
| 15 GPM | 2 h 47 min | 166.7 min |
| 20 GPM | 2 h 5 min | 125.0 min |
| 30 GPM | 1 h 23 min | 83.3 min |
| 50 GPM | 50 min | 50.0 min |
Flow-rate reality check: hose bib with good pressure 6–10 GPM; 1/2 HP transfer pump 20–40 GPM; gravity from an IBC barely 5 GPM through a garden fitting. Time a 5-gallon bucket and divide — it beats every nameplate rating. For the volume side, the tank charts give exact gallons at any depth.
FAQ
How long does it take to fill a 2500 gallon tank with a garden hose?
A typical hose delivers 6–10 GPM — call it 6 h 57 min to 4 h 10 min for 2,500 gallons. Bucket-test your actual flow: a 5-gallon bucket filling in 30 seconds is 10 GPM.
How long with a transfer pump?
At a common 30 GPM transfer rate, about 1 h 23 min. At 50 GPM, 50 min.
Does draining take the same time?
Only if the flow is constant. Gravity drains slow as the head drops, so treat these times as a lower bound for draining.