Randolph Hotel by Graduate Hotels, Oxford, UK - Sidon Water

11777 Bernardo Plaza Ct, Suite 208, San Diego, CA, 92128

Randolph Hotel by Graduate Hotels, Oxford, UK


This 151 bedroom hotel is in a hard water area and historically had not implemented any solutions to resolve the resulting problems, As a consequence, the water systems were badly scaled up, which was impacting on the operation and running cost of essential pieces of equipment

Key Problems

During a site survey and initial inspection, the following areas of concern were raised by the Maintenance Manager:

  • Dishwashers and ice machine were badly scaled
  • Rational steam ovens were badly scaled and required callouts for a full descale every month
  • Potential for increased waterborne bacteria, especially Legionella, due to scale build-up throughout the system
  • General housekeeping issues due to limescale such as showerheads, taps and other water fittings which were regularly scaled up
  • Waste downpipes on the outside of the building were choked with limescale

Water Analysis

A water analysis test carried out in October 2020 gave a result of 221.5mg/l hardness as CaCO3

Our Solution

In December 2020, after the site survey and discussion with the Maintenance Manager, an Integro™ 4 was installed on the mains water supply covering the cold-water tank and system. In addition, and for extra protection to the hot water system, an Integro™ 2 v3 was installed directly before the calorifier.

The Results

Immediately after installation, the Integro technology began to remove historical scale build-up as well as preventing further scale from forming. As confirmation of this, the following observational findings were evident within a matter of weeks and have been ongoing:

  • No call-outs for Rational to descale the steam ovens (previously this would have been monthly)
  • Showerheads, taps and other water fittings in the rooms were proving much easier to clean
  • The ice machine that was serviced by the Integro™ was free from scale
  • Significant decrease in number of Legionella hits
  • Water quality was felt to have improved
  • Dishwashers were keeping free from hard scale build-up
  • Waste water downpipes have cleared
Integro™ 4 on the mains water supply
Integro™ 2 before the calorifier

Environmental Benefits

In addition to the quantifiable savings on energy consumption, labor/call-out charges, equipment downtime, cleaning and Legionella control, the hotel are also enjoying the following additional benefits:

  • Improved water quality and efficiency of hot water equipment
  • Extended life of all water-related equipment and improved efficiency
  • Reduction in scale and corrosion to critical equipment, meaning decreased engineer visits and reduction in spare parts which would otherwise carry direct and indirect increases in the hotel’s carbon footprint
  • Reduced chemical use


Since installation in December 2020, the Integro™ technology has been reported to have been working really well throughout the hotel to eliminate existing scale and prevent any further build-up and the hotel are continuing to use the system to great effect.

What the Hotel had to say

I haven’t had Rational out to descale the steam ovens since we re-opened, we used to have to call them every month to do a full descale so the system is working really well. The dishwashers are also all keeping free from scale. I have noticed a difference in the limescale build up, it’s virtually non-existent since installing the technology. They have caused a few leaks though, where the limescale has been eaten away round joins and valves, but that was to be expected and is a good thing because it identified issues we would never have seen and enabled us to repair them before they caused too much damage.

Lee Martin, Maintenance Manager, Oxford

Click Here to Download this Case Study as a PDF.

Scroll to Top