Small Business and lettings

 

Water analysis for small business

At Water Hygiene Systems we offer the small business the same service as major corporates with a simple testing and analysis service which is quick and thorough.

As I am sure you are aware, a Risk Assessment is a statutory requirement under the Health and Safety at Work Act 1974, Sections 2, 3, & 4; COSHH Regulation 6 and Management of Health & Safety at Work Regulations 1999, Regulation 3.

This service suits many small business and clinical practices like:

Dentist surgeries, orthodontist clinics
Doctor Surgeries and GP, primary care units
NHS Practices, hospitals and care facilities
Leisure Centres, public baths and private water sports facilities
Gymnasiums, training centres and indoor activity places
Schools and other learning centres
and many more

The Risk Assessment should have been completed in accordance with both the HSC ACOP (L8) and BS 8580 documents and to the Legionella Control Association’s Code of Conduct for Service Providers.

A general quote looks like this also underlines what we do

1. Water Hygiene Risk Assessment
To undertake a site survey of all water services so as to provide a Water Hygiene Risk Assessment in accordance with the Health & Safety Commission’s Approved Code of Practice & Guidance (L8) document to include: –
– Line of responsibility
– Full site survey of all water systems
– Asset register of all plant and services
– Risk assessments of all plant and services
– Recommendations of all plant and services
– Simple lined Schematic drawing.
All the above presented in an electronic version and a bound file

Presented on a electronic PDF format.

Follow up service include all sampling

Water Hygiene Systems Ltd will refer to this document also for providing advice to clients following bacteriological analysis of pools used for bathing.

TESTING
Samples for microbiological analysis taken as follows: –

Plant
Legionella species
Colony counts (ie TVC)
Escherichia coli (ie e.coli)
Total coliforms
Pseudomonas aerguinosa

NB. The TVC should be tested at 370C for 24 hours.

All chlorination works.

CWS TANK AND ASSOCIATED WATER SERVICES
CLEANING AND DISINFECTION METHOD SPECIFICATION

This specification details the works required to clean and disinfect water storage tanks in accordance with HSC ACOP (L8).

Preparation

If the tanks to be treated are cross connected, it may be possible to carry out works without suspension of water supplies, except during disinfection of any associated down services systems.

If the tanks are not cross connected then services will be suspended during the works for times to be agreed after a detailed site survey.

Isolate the tank(s) to be treated from the water supply, drain the tank(s) to a suitable point and block off down service connection with bungs to prevent ingress of debris and air and shut the down service valves.

Cleaning

Thoroughly clean all the internal tank surfaces, this may be carried out manually by scraping and wire brushing or by the use of high-pressure water techniques. Finally vacuum clean all internal surfaces including the underside of any cover and wash surfaces with clean water.

Cleaning of plastic or glass reinforced plastic (GRP) tanks will involve manual wiping and scrubbing using abrasive cloths only, before vacuum cleaning any debris produced as a result of the cleaning process.

Remove bungs from tank outlets inside the tank.

Disinfecting

After cleaning, add B200 chlorinating solution whilst filling via the ball valve to achieve a minimum concentration of 50 mg/kg.

Ensure the free chlorine level within the tank(s) does not fall below 50 mg/kg.

Tank and services cleaning and disinfection specification page 2

All associated water services outlets fed by the tank(s) shall be opened in succession, starting from the furthest outlet from the tank and then working back towards the tank. The chlorinated water should be drawn through each and every outlet such that the minimum free chlorine residual is obtained at each outlet.

All outlets are to be closed and the system allowed to stand for a minimum of 1 hour at 50 mg/kg free chlorine or 2 hours at 20 mg/kg free chlorine. The free chlorine residual must be checked regularly to ensure that the reserve is maintained for the appropriate time period.

After the required soaking period, close the inlet and outlet valves of the tank(s) and pump the contents of the tank to waste. Then open the inlet valve and refill the tank(s) with fresh water. If the volume exceeds 5m3, then any free chlorine residuals will be neutralised using G408 (sodium thiosulphate solution) before discharging to foul wastes.

Sample the water to ensure that there is no trace of chlorine present within the tank(s).

Open the outlet valves of the tank(s).

All associated water services fed by the tank(s) shall be flushed by opening the outlets in succession, starting from the furthest outlet from the tank and then working back towards the tank. The fresh water should be drawn through each and every outlet until there is no trace of chlorine present.

Upon completion of flushing, all outlets should be checked to ensure that air locks have not occurred within the system.

Put the tank(s) and water services back into service.

CLEANING AND DISINFECTION OF SHOWER HEADS
AND OTHER TERMINAL FITTINGS

To minimise the risk of Legionnaires disease it is recommended that terminal fittings of water systems that may produce droplets of water, such as showerheads, be maintained in a clean and hygienic condition.

Preparation

The works should proceed as follows:-

· Remove showerhead and flexible hose, where fitted.

· Remove any scale formation from around terminal fitting or immerse the fitting and hose in a scale solvent suitable for use with the material of construction.

· After the scale has dissolved, remove the fitting and flush with copious amounts of fresh water.

Disinfection

· Soak the fitting and hose in a solution of disinfectant for a period of one hour. Solution should contain a minimum 50mg/kg free chlorine.

· Rinse the fitting and the hose with copious amounts of fresh water and replace on system.

Above procedure may be carried out in conjunction with a chlorination or pasteurisation of a system.

TANK CLEANING AND DISINFECTION SPECIFICATION

This specification details the works required to clean and disinfect water storage tanks in accordance with HSC ACOP (L8).

Preparation

· If tanks to be treated are cross connected, it may be possible to carry out works without suspension of water supplies, except during disinfection of any associated down services systems.

· If the tanks are not cross connected then services will be suspended during the works for times to be agreed after a detailed site survey.

· Isolate tanks to be treated from water supply, drain tanks to suitable point and block off down service connection to prevent ingress of debris and shut down service valves.

Cleaning

· Thoroughly clean internal tank surfaces, this may be carried out manually by scraping and wire brushing or by the use of high-pressure water techniques. Finally vacuum clean all internal surfaces including the underside of any cover and wash surfaces with clean water.

· Cleaning of plastic or glass reinforced plastic (GRP) tanks will involve manual wiping and scrubbing using abrasive cloths only, before vacuum cleaning any debris produced as a result of the cleaning process.

Disinfecting

· After cleaning add B200 chlorinating solution whilst filling via the ball valve to achieve a minimum concentration of 50 mg/kg.

· Ensure the free chlorine level within the tank does not fall below 50 mg/kg.

· Allow the water to stand for the required period of 1 hour, which may vary due to external constraints.

Tank cleaning and disinfection specification page 2

· After the required soaking period, pump the contents of the tank to waste until no trace of chlorine is present. If the volume exceeds 5m3, then any free chlorine residuals will be neutralised using sodium thiosulphate or sodium sulphite solutions before discharging to foul wastes.

· Remove blocks from tank outlets inside the tank.

· Refill the tank from the water supply and open the down service valves when the tank has refilled.

· Put the tank back into service.

BASE EXCHANGE WATER SOFTENER DISINFECTION PROCEDURE

This specification details the works required to disinfect Base Exchange water softeners in accordance with HSC ACOP (L8).

Preparation
· Customer to “run down” salt level in the brine tank to a minimum level of operation.

· Isolate softener, by closing both the inlet and outlet valves and opening the by pass valve, allowing water to flow to service, if required.

· Empty contents of brine tank into plastic bags/containers. The customer is responsible for disposing of these bags/containers.

Cleaning
· Clean the brine tank, by wiping with a soft cloth and vacuum cleaning the base of the tank.

· Some brine tanks may have pebbles or stones at their base. These should be removed and soaked in a solution containing at least 50-mg/kg free chlorine for a period of at least 1 hour, before being put back into the brine tank.

Disinfection
· Refill the brine tank with water to the normal brine level and add HA30 chlorinating solution to achieve a free chlorine level of 500 mg/kg.

· Inject chlorinated solution into each ion exchange vessel in turn, allowing the solution to pass to drain and preventing the solution from passing to service. Ensure the free chlorine reserve of the water passing to drain is at least 250 mg/kg.

· When all the solution has been injected into the ion exchange vessel, the plant is to be shut down. The contact period of chlorinated solution on each resin bed should be 20 – 30 minutes.

· After the contact period, rinse the solution from each ion exchange vessel using the best quality water available.

· Refill the brine tank with fresh salt.

· The softener shall then be initiated into a regeneration sequence to flush the resin bed and to prime the system for delivering soft water. During regeneration the drain shall be tested to ensure chlorine levels are less than 1 mg/kg before returning unit to service.

· Close the by pass valve and open the inlet then the outlet valves, so allowing softened water to pass to service.

Please contact us to discuss any requirements you may have in more detail on Tel: 01494 453 977 Email: info@waterhs.co.uk

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