Renting or buying a submersible pump is the fast option for draining a pool, but a garden hose and gravity will move water just as effectively if your pool sits higher than the discharge point. Learning how to drain pool with hose the right way saves $80 to $200 in pump rental fees, makes partial draining for winterization easy, and works for above-ground pools, inground pools, and stock tank pools alike. The catch is matching the technique to your specific elevation difference and avoiding the mistakes that break the siphon halfway through.
When a Hose Works and When It Doesn’t
Siphoning works because of gravity and atmospheric pressure. Water flows from the higher pool surface through the hose to a lower discharge point, with the difference in elevation driving the flow rate. The hose acts as a continuous conduit; air entering anywhere breaks the siphon and stops the flow.
The siphon technique works if:
- The pool’s water surface sits at least 3 feet higher than the discharge point
- The total hose length is under 100 feet (longer runs lose too much flow to friction)
- You have access to a continuous water-tight hose without leaks at connections
- The discharge point is approved for pool water (more on that below)
If your pool sits below ground level or your yard is flat with no lower outlet, you need a pump. Trying to siphon uphill or across flat ground wastes hours.
Equipment You’ll Need
- 50- to 75-foot garden hose, 5/8 or 3/4 inch diameter, in good condition without splits
- Hose nozzle or shutoff valve at the discharge end (optional but helpful)
- A submerged weight to hold the hose at the pool’s deep end
- Garden faucet adapter or hose-to-pool connection
- Bucket or barrel as backup catch point
For pools larger than 5,000 gallons, plan for an overnight drain. A standard 5/8-inch garden hose moves about 8 to 12 gallons per minute (480 to 720 gallons per hour) by siphon, depending on elevation drop. A 15,000-gallon pool takes 20 to 30 hours to drain this way.
Starting the Siphon: The Garden Faucet Method
The cleanest way to start a siphon is to fill the hose with water from a garden faucet, then transition to gravity flow.
- Connect one end of the hose to an outdoor faucet. Run the other end into the pool, weighted down at the deep end.
- Turn the faucet on full and let water flow until you see steady water emerging from the submerged hose end into the pool. This fills the hose entirely.
- While water is flowing into the pool, quickly disconnect the hose from the faucet and lower that end to a point lower than the pool’s water surface — ideally at least 6 feet lower.
- Water should now flow out of the lowered end via siphon. Confirm flow continues without interruption.
- Direct the flowing end to your approved discharge location.
The transition from faucet to gravity must happen smoothly. If air enters the hose during the disconnect, the siphon won’t establish. Practice once with a bucket of clean water before starting on the pool itself.
Mouth-Suction Method (Backup Approach)
If a faucet isn’t convenient, you can prime the siphon by mouth — but only on a clean hose and clean pool water. Don’t do this if the pool is heavily chlorinated, contains algae, or smells off.
- Submerge one end of the hose fully in the pool, weighted at the bottom.
- Suck the other end like a straw to draw water through the hose. When you see water approaching your mouth, immediately pull the hose away and lower the end below the pool’s water level.
- Water should continue flowing by siphon.
The submerged-bucket method is safer. Submerge the entire hose in a 5-gallon bucket inside the pool, lift it out fully filled with water (keep both ends sealed by hand or by pinching), then lower one end to discharge while keeping the other submerged.
Where Pool Water Can and Cannot Go
This is where homeowners get into trouble. Most municipalities prohibit pool water from entering:
- Storm drains in the street (chlorine kills aquatic life downstream)
- Neighboring properties (causes flooding and legal disputes)
- Natural waterways, creeks, or ponds
- Septic system drain fields (overloads the system)
Acceptable discharge locations vary by jurisdiction. Common options:
- Sewer cleanout for systems on municipal sewer (check local code first — most require notification or limits on flow rate)
- A grassy area on your own property, slowly enough that water absorbs and doesn’t run off
- Designated discharge to a French drain or dry well
Stop chlorinating the pool 5 to 7 days before draining if possible. Test that free chlorine is below 0.1 ppm before discharging to lawn or landscape. Standard test strips from Taylor Technologies or Leslie’s Pool Supplies cost $15 and confirm safe levels.
Avoiding Common Siphon Failures
Three problems trip up most first-time siphoners.
Air leaks at the hose connection or splits: A pinhole anywhere in the hose breaks the siphon. Inspect the hose by holding it up to sunlight before starting. Replace hoses older than 5 years or with visible cracking at couplings.
Discharge end above pool water level: Even momentarily lifting the discharge end above the pool’s surface stops the flow. Once stopped, you have to reprime from scratch. Keep the discharge end at least 3 feet below pool water level throughout.
Hose end sucking air at the pool: If the submerged end of the hose breaks the pool surface as water level drops, air enters and stops the siphon. Weight the hose end with a small rock or sandbag to keep it underwater. For above-ground pools, this is the primary failure mode — re-weight the hose end every few hours as the level drops.
Partial vs Full Drain
Full drains are rare. Most pool maintenance only requires draining 50 to 70 percent of the water to lower the level for winterization or for water replacement. Mark the desired stopping level on the pool wall with a piece of tape before starting, so you can pull the hose at the right moment.
Never fully drain an inground pool without consulting a pool professional. Empty fiberglass and vinyl-liner pools can shift or buckle from hydrostatic pressure in saturated soil. Concrete pools can crack from frost or shifting ground without the water weight holding them in place.
Disposal of the Last Few Inches
Siphons can’t drain the very bottom of the pool because the hose end needs to remain submerged. The last 4 to 8 inches of water typically gets removed with a wet/dry shop vac or a small submersible utility pump. A Wayne SubBob 1/4 HP utility pump from Home Depot runs $80 and handles the leftover water in 30 minutes.
After the Drain
If draining for repair or repainting, inspect the empty pool quickly for cracks, liner separation, or surface damage. Take photos for any insurance claims. Refilling: budget the same time as draining plus 25 percent. A 15,000-gallon pool refilled from a standard residential water service takes 12 to 18 hours and adds $30 to $80 to your water bill depending on local rates.
