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Spa & Hot Tub Glossary - Terms & Words Used in Australia

This glossary of spa related terms is designed to help our clients who are new to the world of spas and hot tubs. Some words differ in Australia vs other parts of the world.

This glossary is currently being updated as we go.

Air Control or Venturi: Mounted on the lip of the spa or at the equipment shroud, to induce air to the jets. This is usally a partially rotating handle or dial.

Bath Pump / Spa Bath Pump

Air Blower / Blower

Air Button

Air Switch

Air Switch Box

Cabinet: The panelling that surrounds the spa, also called a skirt.

Check Valve / One-way Valve

Gas Heater

Touchpad / Keypad / Control Panel: Mounted on the lip of the spa. The panel that controls the spas functions.

Circulation Pump / Circ Pump / Filtration Pump

Jet Pump / Boost Pump 

Control Box / Controller: Basically the brain of the spa. Power is distributed to all functions of the spa, pumps, ozonator, heater, fiber optics, etc. Also called a Spa Pack.

Drain: The fitting located inside the cabinet that drains water from the spa.

Filter: The filter cleans the spa and removes particles and debris and protects the equipment from foreign substances.

Filter Cartridge / Filter Element

Heat Pump

Heater Element / Heater Assembly

Hi-Limit / High Limit / Overtemp / Klixon

PCB / Circuit Board / Printed Circuit Board

RCD - Residual Current Device: The electronic safety switch installed in the switchboard of your house to give power to the spa. This is a non-user serviceable part and is required by law in Australia.

Gate Valves: T-handled valves located at the inlets and outlets of the equipment. The gate valve blocks or opens the water line by the equipment.

Heater: The thermostatically controlled heater raises the temperature of the water to the desired degree. This is located under the control box in the equipment area.


Jet / Jet Face: The fittings on your spa that direct the flow of water for massaging action.

Jet Body

Mechanical Seal

O-ring / Gasket

Ozone: A water purification supplement method using Ozone gas, made by an Ozone Generator unit, can reduce your sanitizer needs by up to 25%.

Ozone, a pH-neutral oxygen compound, is created when a molecule of oxygen passes between a high voltage electrode and a stainless steel grounded electrode. creating an “energy field of electrons” This field instantly converts oxygen molecules into ozone, which is dispersed throughout the water destroying algae and bacteria. With less contamination in the water, less chemicals are required to keep the water clean. This saves you both time and money.

The Corona Discharge ozone generator also saves energy, compared to the standard ultraviolet ozone generator. Corona Discharge technology produces twice the concentration of ozone while consuming less than one-tenth the electricity.

pH: Stands for “Potential for Hydrogen” This is the term used to describe the acidity (low pH) or Alkalinity (high pH) condition of the water. pH outside the ranges recommended by manufacturers damages components.

Plumbing Union / Barrel Union: the threaded collar that connects a water line to a component such as a pump or heater.

Skimmer/Filter Housing: This is the square opening with the floating gate at the water level. The skimmer removes surface debris to the filter. 


Temperature Sensor / Temp Sensor / Thermistor

Jet Diverter: A valve that diverts water between 2 or more areas, found on the top side of a spa generally.

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