Maintenance
I. Replacement Parts
Ultraviolet systems are rated based on a dosage level of UV-C radiation into the water (mJ/cm²), with
30mJ/cm² being the standard level of disinfection and a minimum dose of 40mJ/cm² required to comply
with Australian Drinking Water Guidelines. Ultraviolet Lamps are rated with a 9000-hour (1 year) lifespan,
after which point the lamp will naturally degrade and the level of radiation produced by the lamp cannot be
guaranteed. They are designed for continuous run, not for intermittent operation.
The UV lamp sits inside a quartz thimble, which protects the electrical components of the lamp from making
contact with the water. We specifically use quartz (fused silica) for this application because it is strong,
exhibits thermal resistance, and has excellent UV transmission properties. However, over time, metal ions
fused within the silica structure of the quartz thimble interfere with the UV-C radiation produced by the
lamp, which reduces the UV transparency of the glass and causes it to become fragile. This process is
called solarization.
Tannin, bio-film, algae, and scale can also build up on the outside of the glass thimble, further preventing
ultraviolet light produced by the lamp from penetrating through the thimble, and impairing the system's
ability to sanitise the water passing through.
Thus, we recommend replacing the lamp every 12 months, and the thimble every 1-2 years.
Lamp Replacement | Every 12 Months
GT7-2K-Lamp
14W Replacement UV Lamp Suit GT7-2K
GT7-4K-Lamp
20W Replacement UV Lamp Suit GT7-4K
GT7-8K-Lamp
40W Replacement UV Lamp Suit GT7-8K
GT7-9K-Lamp
40W Replacement UV Lamp Suit GT7-9K
GT7-16K-Lamp
87W HO Replacement UV Lamp Suit GT7-16K
Quartz Thimble Replacement | Every 1
– 2 years depending on water quality
GT7-2K-Thimble
331mm x 23mm OD Single Open-End Thimble Suit GT7-2K
GT7-4K-Thimble
490mm x 23mm OD Single Open-End Thimble Suit GT7-4K
GT7-8K-Thimble
895mm x 24.5mm OD Single Open-End Thimble Suit GT7-8K
GT7-9K-Thimble
895mm x 23mm OD Single Open-End Thimble Suit GT7-9K
GT7-16K-Thimble
895mm x 23mm OD Single Open-End Thimble Suit GT7-16K
O-Tings | Every 1
– 2 Years, must be changed if installing a new quartz
GT7-2NSF-OR
O-Ring Suit 23mm Thimble (GT7-2K, GT7-4K, GT7-8K & GT7-16K)
GT7-8NSF-OR
O-Ring Suit 24.5mm Thimble (GT7-8K )
Replacement Ballast | Replace after 5 years as a precaution
GT7-8K-PS
10W
– 40W AU Certified (RCM) Ballast to Suit 4 Pin Lamps
GT7-16K-PS
33W
– 120W AU Certified (RCM) Ballast to Suit 4 Pin Lamps
Mounting Clamps
GT11-8G
1 PC Plastic Mounting Clamp Suitable for U/Sink Installation.
GT7-8-BRK
1 Pair Aluminium Mounting Brackets Suit GT7-4K GT7-8K GT7-9K GT7-16K
Thermal Relief Valves
GT7-53
¾” F-F BSP Thermal Relief Valve – 316SS + 2m Drain Tubing
GT7-51
1” F-F BSP Thermal Relief Valve – 316SS + 2m Drain Tubing
GT7-52
2” F-F BSP Thermal Relief Valve – 316SS + 2m Drain Tubing
