How to Maintain Your TUNDRA Ice Bath

This is the complete care, maintenance and user guide for the TUNDRA Borealis™ Gen 5 — the heater & chiller at the heart of every TUNDRA tub system. Keep it bookmarked for setup, water care, filter changes and troubleshooting.

Maintenance overview

We recommend keeping the Borealis running continuously — this keeps the water circulating, filtered and ozone-sanitised at all times. Follow the routine below to keep it performing at its best.

1. Metal Mesh Cleaning
   Rinse the metal mesh under running water weekly to prevent debris buildup and maintain optimal flow.
2. Filter Cartridge Replacement
   Monitor the flow rate on the display. When it stays at 12–15 L/min after cleaning the mesh, replace the cartridge. Auto-shutoff at 8 L/min.
3. Water Replacement
   Change the water every two weeks at the latest. Quality drops faster when the unit is off. Use mild sanitisers to extend water life.
4. Extended Inactivity
   If unused for 1+ week, drain the tub and chiller via the drain screw at the back, at the bottom of the filter compartment.

Filter system & replacement

The Borealis Gen 5 uses a dual filtration system — a 20-micron PET cartridge surrounded by a protective metal mesh — that together trap debris and protect the pump.

Reading the flow rate

Flow	Status	What it means
32–34 L/min	Optimal	New filter and clean mesh. System running at peak performance. No action required.
20–30 L/min	Normal	Flow is gradually decreasing. Continue weekly mesh cleaning. Monitor the display.
12–15 L/min	Replace Cartridge	If flow stays in this range after cleaning the mesh, the filter cartridge needs replacing.
8 L/min	Auto Shut-off	The unit switches off automatically at this threshold to protect the pump from excessive strain.

Tip — clean the metal mesh weekly to maintain flow. A clean mesh with persistently low flow means the cartridge is spent.

Replacing the filter cartridge

Before you begin: ensure the Borealis is powered off and unplugged.

1. Open the Filter Housing
   Locate the housing on top. Twist counterclockwise to open. Use the lever wrench if tight.
2. Remove Old Filter & Mesh
   Carefully pull out the old cartridge. Remove and rinse the metal mesh guard under running water.
3. Clean the Housing
   Rinse the inside of the housing thoroughly to remove any sediment or debris.
4. Install New Filter
   Place the clean metal mesh back, then insert a fresh filter cartridge. Ensure a snug fit.
5. Close & Secure
   Twist clockwise to close. Hand-tighten, then use the wrench for a firm seal.
6. Power On & Verify
   Plug in and switch on. Confirm water flow reads 32–34 L/min on the display.

Cleaning the dust filter

The dust filter protects the cooling system’s air intake. Clean it monthly — more often in dusty environments. Press the recessed button to release the cover, pull the dust mesh straight out, rinse under running water, dry fully, then slide it back until secure.

Water replacement

Despite the Borealis’s ozone purification and filtration, regular water changes are essential. Replace the water at least every two weeks — sooner in the scenarios below.

Signs it’s time to change the water

Storage & draining

If the Borealis will sit unused for a week or more, drain both the tub and the chiller. Power off and unplug, open the drainage nut at the back of the unit (bottom of the filter compartment) and let the chiller empty through the outlet. Allow it to dry, then refit the drainage nut before next use.

Safety precautions

Safety is paramount when electricity and water are involved. Review these before first use.

Quick start guide

1. Connect the Pipes
   Attach the 3/4-inch inlet and outlet pipes securely to your tub. If using a bathtub, place both loose pipe ends in the water.
2. Position the Unit
   Place the Borealis in a well-ventilated area with at least 30 cm clearance on all sides.
3. Fill Your Tub
   Ensure your tub is filled with sufficient water before starting the machine.
4. Prime the Filter Housing
   Open the filter housing cap, fill with water manually until full, then close tightly.
5. Power On
   Plug in. For the Elite model, avoid extension cables unless rated for 1,950W.
6. Set Temperature & Start
   Use the touchscreen to set your desired temperature, then press the on/off switch.

Control panel

1. On/Off Switch
   Power the unit on or off.
2. Temperature
   Adjust target temperature with the +/− slider (3–42°C).
3. Water Flow
   Displays current flow rate in L/min.
4. Locking
   Press 3–5 seconds to lock or unlock the screen.
5. Fault Warning
   Blinks when the machine detects an issue.
6. Settings
   Access ozone time, brightness, screen sleep, Wi-Fi, and more.
7. Status Indicators
   Show current status of Wi-Fi, Ozone, Cooling or Heating, Defrosting, and Room Temperature.

Wi-Fi & Smart Life app

1. Download the Smart Life app from the App Store or Google Play.
2. Power on the Borealis and enter the Settings menu.
3. Press the Wi-Fi button for 3–5 seconds until the indicator blinks.
4. Open Smart Life and select 'Add Device'.
5. Connect to your 2.4 GHz Wi-Fi network and enter the password.
6. Once paired, the Borealis appears in your device list.

Troubleshooting

Problem	Fix
Unit does not power on	Check the power source, the RCD breaker at the back, and any surge protectors in the chain.
Inadequate heating or cooling	Verify the temperature setting. Ensure 30 cm clearance on all sides. Extreme ambient temperatures may affect performance.
Reduced water flow / flow error	Clean the metal mesh. If flow stays at 12–15 L/min, replace the cartridge. Check hoses for kinks and ensure sufficient water level.
Water leakage	Tighten all hose connections and check rubber seals. Inspect the unit and hoses for visible damage.
Unusual noises (gurgling, bubbling)	Check water level — it must cover the tub outlet. Tighten all hoses and the filter housing cap.
Water odour or algae	Replace the water immediately. Change the filter if overdue. Clean the tub surface.

For persistent issues, contact info@tundra.health. Do not attempt to disassemble or repair the unit yourself.

Frequently asked questions

Specifications

Model	Borealis Pro 1.0 HP	Borealis Elite 2.0 HP
Dimensions (L × W × H)	62.9 × 39.4 × 60.3 cm	67.7 × 42.3 × 62.6 cm
Weight	35 kg	40 kg
Input power	1,060 W	1,950 W
Cooling range	Down to 3°C
Heating range	Up to 42°C
Water flow	32–34 L/min (new filter) · auto-shutoff at 8 L/min
Filtration	20-micron PET with metal mesh guard
Purification	Built-in ozone generator
Voltage	AC 220–240V, 50/60Hz
Water resistance	IPX4

Warranty

The Borealis Gen 5 is covered by a one-year limited warranty against defects in materials and workmanship. Covered: manufacturing defects and normal use per this guide. Not covered: misuse, cosmetic wear, harsh chemicals (e.g. chlorine), water ingress beyond IPX4, or failure to replace filters / change water.

This product should not be used by children without direct adult supervision.