How To Drain A Hot Spring Spa: A Comprehensive Step-by-Step Maintenance Guide

To drain a Hot Spring spa effectively, first disconnect the GFCI power supply to prevent heater damage, then connect a standard garden hose to the internal drain valve or utilize a submersible pump for accelerated evacuation. This process should be performed every 3 to 4 months for traditional chlorine systems or up to once a year for FreshWater Salt Systems to maintain a Total Dissolved Solids (TDS) level below 1,500 ppm.

Pre-Drain Readiness and Equipment Inventory

Draining your Hot Spring spa is a foundational aspect of hot tub ownership that ensures water hygiene, protects the mechanical integrity of the SilentFlo 5000 circulation pump, and maintains the aesthetic brilliance of the Lucite acrylic shell. Before initiating the process, it is vital to understand that a Hot Spring spa is a sophisticated piece of hydrotherapy equipment. Unlike a bathtub, it contains a complex network of plumbing lines where biofilm, calcium scale, and organic contaminants can accumulate.

The duration of a full drain and refill typically spans 2 to 4 hours, depending on the gallon capacity of your specific model—whether it is a compact Jetsetter or a cavernous Grandee—and the method of drainage used. Choosing a day with mild weather is preferable, as draining a spa in sub-freezing temperatures can put the plumbing at risk of residual water freezing and cracking the manifolds.

Essential Equipment and Benchmarks

• Submersible Sump Pump: While gravity draining via the built-in valve is possible, a 1/4 HP or 1/2 HP submersible pump can empty the spa in 20–30 minutes compared to 2 hours.
• High-Quality Garden Hose: Ensure the hose is long enough to reach a legal drainage area (usually a sewer clean-out or a flat area of your lawn away from the foundation).
• Jet Line Cleaner: A surfactant-based plumbing purge (e.g., Hot Spring FreshWater Spa System Flush) to loosen biofilm before draining.
• Tri-X or Standard Filter Cleaner: Degreaser solution for soaking the filter cartridges while the spa is empty.
• Non-Abbrasive Cleaning Supplies: Soft microfiber cloths and a pH-neutral shell cleaner specifically formulated for acrylic.
• Sub-Panel Access: Direct access to the 20-amp and 30-amp GFCI breakers (for 220v models) or the cord-mounted GFCI (for 110v models).

The Hot Spring Spa Draining and Refilling Protocol

Successfully draining your spa requires a systematic approach to ensure that the heater, pumps, and control head are not compromised by "dry firing" or air locks during the restart phase. Hot Spring Spas utilize a specific plumbing architecture that necessitates filling through the filter standpipe, making the sequence of operations critical.

Step 1: The Pre-Drain Biofilm Flush

Twenty-four hours before you plan to drain the water, add a plumbing purge or "jet line cleaner" to the warm spa water. Ensure all jets are open and the aeration (air induction) valves are closed. Run the jet pumps on high for at least 30 minutes to allow the cleaner to circulate through the secondary plumbing lines. This chemical treatment breaks down the "sludge" that traditional sanitizers cannot reach. Leave the solution in the water overnight for maximum efficacy.

Step 2: Total Power Disconnection

Safety is paramount. Locate your spa’s electrical sub-panel and flip both the 20-amp and 30-amp breakers to the "Off" position. For 110v "Plug-and-Play" models, unplug the cord from the wall outlet.

Warning: Never attempt to drain the spa while the power is on. If the water level drops below the heater or the circulation pump intake while the system is live, you risk catastrophic component failure or a fire hazard due to dry-heating.

Step 3: Accessing the Drain Valves

Hot Spring Spas are typically designed with two drain valves located behind the removable equipment access panel, though some newer Highlife models feature an external drain cap on the base frame.

1. Remove the screws securing the equipment compartment door.
2. Locate the primary drain hose. It is usually a flexible clear or black hose with a plastic bib at the end.
3. On many models, there is a "primary" drain for the main vessel and a "secondary" drain for the internal plumbing lines. Ensure you have access to both to remove the maximum amount of water.

Step 4: Initiating the Gravity Drain or Pump

If using the gravity drain:

1. Unscrew the cap from the drain valve.
2. Attach your garden hose to the threads.
3. Open the valve by turning the handle or pulling the nozzle outward (depending on the specific valve design).
4. Run the hose to a lower elevation point to maintain a siphon.

If using a submersible pump:

1. Place the pump at the deepest point of the spa (the footwell).
2. Run the discharge hose to your drainage area.
3. Plug in the pump and monitor the progress.
4. As the water reaches the bottom, use the pump to "vacuum" the remaining puddles in the seating areas.

Pro-Tip: While the spa is draining, do not leave it unattended for long periods. Ensure the water is flowing to a safe location where it will not cause soil erosion or flood a neighbor’s property.

Step 5: Filter Removal and Deep Cleaning

As the water level drops below the filter compartment, remove the filter cover and unscrew the filter cartridges. This is the ideal time to inspect your filters. If you use Hot Spring’s proprietary Tri-X ceramic filters, they are dishwasher safe (without soap and without the heated dry cycle), but a professional filter soak is usually more effective at removing oils and minerals. Rinse them thoroughly with a high-pressure garden hose nozzle until the water runs clear.

Step 6: Shell Maintenance and Detailing

Once the spa is empty, use a soft cloth to wipe down the acrylic shell. Avoid any household cleaners containing ammonia or bleach, as these can damage the Lucite surface and cause foaming once the spa is refilled. Focus on the "waterline" where body oils and calcium deposits often form a ring. If you have stubborn scale, a 50/50 mixture of white vinegar and water is an effective, spa-safe descaler.

Step 7: The Refilling Process (The Standpipe Method)

This is the most critical step for Hot Spring owners. To prevent air locks in the SilentFlo 5000 pump, you must refill the spa through the filter standpipe.

1. Close all drain valves and replace the caps.
2. Place your garden hose down into the gray standpipe (the hole where the filter was screwed in).
3. Turn on the water. This forces air out of the pump and heater housing as the water fills from the "inside out."
4. Fill the spa until the water level reaches the point specified in your owner’s manual—usually about one inch above the highest jets.

Water Volume and Drainage Velocity Benchmarks

The following table provides technical specifications for common Hot Spring Spa series. Knowing your volume helps in calculating the correct chemical dosage after the refill.

System Recovery and Air Lock Mitigation

Even with careful execution, technical issues can arise during the drainage and restart sequence. Addressing these promptly prevents long-term damage to the control system.

• Air Lock in the Circulation Pump

  
  
  
  • Root Cause: Air trapped in the plumbing lines preventing the pump from moving water, often caused by filling the spa from the footwell instead of the standpipe.
  • Actionable Fix: Turn off the power. Loosen the heater union or the pump union slightly until you hear a "hiss" of air escaping and see water trickling out. Re-tighten the union and restore power.

• GFCI Breaker Trips Immediately Upon Restart

  
  
  
  • Root Cause: Moisture in the ozonator or a "dry fired" heater element that has shorted out.
  • Actionable Fix: Ensure all electrical components are dry. If the spa was empty for a long period, the heater gasket may have dried out. If the trip persists, disconnect the heater from the control box to see if the breaker stays on; if it does, the heater element requires replacement.

• Residual Water in the Bottom (Stubborn Puddles)

  
  
  
  • Root Cause: The spa is not perfectly level, or the drain valve is positioned slightly higher than the lowest point of the footwell.
  • Actionable Fix: Use a wet/dry shop vacuum to suction the remaining 2–3 gallons of water from the footwell and the jet recesses. This is especially important if you are winterizing the spa.

Frequently Asked Questions

How often should I drain my Hot Spring spa with a salt system?

If you are using the FreshWater Salt System, you typically only need to drain and refill your spa once every 12 months. This is because the system generates chlorine more efficiently and maintains water balance longer than traditional bottled chemicals. However, you should still test for Total Dissolved Solids (TDS) and drain if the levels exceed 1,500 ppm above your start-up water.

Can I drain my hot tub water onto my lawn or plants?

Yes, provided the sanitizer levels (chlorine or bromine) are near zero and the pH is neutral (7.2–7.6). It is recommended to stop adding chemicals 48 hours before draining to allow the sanitizer to dissipate. Avoid draining water directly onto "salt-sensitive" plants if you are using a salt-water system.

Why is there a second drain valve inside my Hot Spring cabinet?

The secondary drain is designed to empty the internal plumbing lines and the heater manifold. While the primary drain removes the bulk of the water from the shell, the secondary drain is essential for a "deep drain" or for winterization to ensure no water remains in the low-lying pipes where it could stagnate or freeze.

What should I do if my spa won't start heating after a refill?

Check the "Ready" and "Logo" lights on your control panel. if they are flashing, it indicates a flow issue. Ensure the filters are clean and that you filled the spa through the standpipe to avoid an air lock. Most Hot Spring heaters require a specific flow rate to engage; if the circulation pump is air-locked, the heater will remain off as a safety precaution.

Professional Spa Maintenance Support

Regularly draining and cleaning your Hot Spring spa is the most effective way to protect your investment and ensure a healthy soaking environment. If you encounter persistent technical issues or require a professional system flush, contact your local authorized Hot Spring dealer for expert service and genuine replacement parts.