In 2014 a refurbishment programme was undertaken at the school that included changes to the heating system, but the question was, had the Scalebusters® actually done their job? The ideal chance came when the three original units were removed 16 years after their installation and the old units were returned for a detailed examination.
Their effectiveness was immediately evident from the condition of the calorifiers. The contractor involved in their replacement took internal photographs of the original, 16 years old calorifiers, shown here, before they were removed. The images show no build-up of scale on either the cylinder walls or the heat exchange walls demonstrating conclusively that the ScaleBusters® had performed their function of inhibiting the build-up of hard scale throughout their operational life.
But what of the Scalebusters® themselves? If the old boilers hadn’t been replaced would they have carried on working even longer? External inspection showed the body of the units to be in good order. The nickel plating was in good condition and there was no corrosion or pitting of the brass. The central spindle and all PTFE fins were in good order on the flanged units. All the fins were present and were tight within their housing indicating that minimal reduction in the anode had taken place.
The service life in the case of the removed ScaleBuster® units within the system and water type at the James Hornby School was found to be well in excess of 15 years.
How do Scalebusters® work?
The Scale-Buster® unit conditions hard water (preventing lime-scale build up) by combining a number of actions that release zinc ions into the water as it passes through the unit. It does not contain magnets or involve any sort of magnetic process. It needs no power supply and works completely automatically with no control panel to maintain. They are WRAS approved and can be installed with new systems or retro-fitted to existing installations.
Scale-Buster® is designed to cause precipitation of calcium carbonate into the water stream. This is as a result of the breakdown of the bicarbonate into carbon dioxide, water and carbonate due to the effects created within the Scale-Buster® itself. The particles which are formed in the water stream act as nuclei for the formation of further scale when the water is heated. In this way, scale deposition upon heating surfaces is minimised.
When a salt is precipitated from solution it results in a relatively less saturated solution remaining. The less saturated water is then able to dissolve and breakdown existing scale from pipe surfaces which form bigger particles that can then be removed from the system with a filter.