Case Studies
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Solutions Aqua Analyse can provide if you need to comply with the Legionella “Approved Code of Practice and Guidance’ policy (referred to as L8).

Background:

A Doctors Surgery, based in Hampshire, underwent a Care Quality Commission (CQC) inspection which resulted in the need for an assessment for compliance with the “Approved Code of Practice and Guidance” (L8). The surgery had facilities on two floors and all the services were mains fed with a pressurised hot water cylinder installed six months previously.

The Surgery approached Aqua Analyse for a solution.

Our objectives were to assess the domestic water services and review the management practices of the Surgery and to ensure there was no contamination in the system.

Having evaluated the client’s needs it was clear that the system required a thorough clean.

A survey was conducted on the premises by Aqua Analyse. Results from the Risk Assessment revealed that the water system was not up to the required Water Regulation Standards;

1, The heating pressurisation unit was overflowing.

2, Thermostatic Mixing Valves (TMVs) were in need of replacing.

3, Some contamination was found in mains water which contained legionella and high Total Viable Counts (TVCs).

The Management Control System was not suitable and also needed amending. Temperatures were found to be within the ranges suitable for legionella growth.

A Legionella Policy was in place but there was no Written Scheme and management paper work or log book for record keeping.

Solution:

Implementation of the controls that had been advised in the risk assessment i.e.

  • The Temperature Pressure Relief Valve (TPRV) was replaced.
  • Temperature monitoring and recording from outlets was implemented.
  • Taps/pipes were cleaned.
  • Shower cleaning was initiated.
  • A sampling programme was devised and implemented,
  • TMVs were serviced annually or replaced where necessary.
  • A written scheme put in place for management / log book record keeping

Outcome:

The Doctors Surgery’s water was subsequently tested and legionella was not detected in the system. Temperature monitoring systems were put in place, along with tracking and maintenance processes to provide protection from any potential future legionella growth.

The client’s mind was putat rest as they now had a process in place that ensured their risk to Legionella was minimised and if again detected, procedures were in place to detect and rectify the situation within the Governments guidelines. CQC were put to rest.

Solutions Aqua Analyse can provide if you need to comply with the Legionella “Approved Code of Practice and Guidance’ policy (referred to as L8).?

Background:

A Care Home based in Gloucestershire contracted Aqua Analyse to undertake Legionella Control on its premises to comply with the “Approved Code of Practice and Guidance” (L8). The Care Home had 4 different multi-storey buildings, several cold water storage tanks and water heaters.

The Care Home had over 200 roomswith toilets with almost all the rooms fitted with Thermostatic Mixing Valves (TMVs). Temperature monitoring of the taps were undertaken by the Site Manager of the premises. The Care Home had a Legionella Policy and Written Scheme in place and a Log Book for record keeping.

Aqua Analyse were tasked with:

  • Conducting a Legionella Risk Assessment
  • Quarterly shower and tap de-scaling and disinfection.
  • Six monthly sampling from selected outlets.
  • TMV Service and Fail test.
  • CWST tank clean and maintenance.

The first samples taken from the site showed positive legionella results from certain areas; a shower and a bath with Thermostatic Mixing Valves (TMVs). There were also samples taken from non TMV outletswhich also tested positive.

Solution:

The positive areas were shut off from use, dead legs and blind end areas picked up in the risk assessment were removed and a system disinfection was carried out whereby the areas and connected tanks were treated with Sodium Hyperchlorite. The tanks were cleaned to comply with the BS6700 standard.

The positive areas were then re-sampled.

This resulted with positives again from some outlets associated with TMVs but the non TMV fed outlets tested showed “Not Detected”. This pointed towards the TMVs being the issue; possibly due to the water not the right temperature at taps due to the TMVs, some of the TMVs were inaccessible to service. Aqua Analyse subsequently serviced TMVs, changed the hoses (both shower and flexi hoses) associated with the outlets and re-sampled. Some still resulted in a positive reading which then indicated a more severe issue.

The two infected buildingswere old with many TMVs and possible dead-legs together with blind ends that were not visible. Aqua Analyse suggested that instead of spending money sampling and carrying out local disinfections,which may or may not have solved the issue, a treatment system be installed to continually provide a chemical dose into the system and take samples to monitor progress on a monthly basis. This treatment was installed for a period for six months to a year after which treatment would be reviewed.

Outcome:

The Care Home water system was subsequently tested and legionella was no longer detectedin the system. The client’s mind was put at rest as they now had a process in place that ensured their risk to Legionella was minimised and if again detected, procedures were in place to detect and rectify the situation within the Governments guidelines.

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