APPENDIX 6 to legionella Procedure
SHOWER DESCALE METHOD STATEMENT
1. Remove and dismantle shower head and hose. Clean off any large particles
and deposits.
2. Soak in Sulphamic acid solution (A) for 1 hour. Wear gloves and goggles.
3. Rinse in clean water and brush off any remaining deposits. See Note “d”.
4. Soak in chlorinated water solution (B) for 60 minutes.
5. Rinse in clean water.
6. Reassemble shower head and reconnect to hose.
7. Turn on shower and run for 2 minutes at maximum temperature.
8. Following flushing complete a test of effluent water from the shower. pH
should be equal to that of the incoming main. Free chlorine concentration
should be <1.0 mg.L-1prior to returning the shower to service.
NOTES
A. Solution (A) = Dissolve approximately 50g full Sulphamic Acid Powder to 1
litre hot water. Allow to cool and store in sealed plastic container. Depending
on shower contamination the solution may be reused several times.
(*Labelled “ACID/CORROSIVE”).
B. Solution (B) = Dilute 10 ml Sodium Hypochlorite in 1 litre cold water. (14%
strength will produce approx. 1400 mg.L-1 free chlorine.). Depending on
contamination this solution may be reused several times. Store in sealed
plastic container (preferably black and labelled STRONG OXIDISING
AGENT).
C. The shower hose fitting may also benefit from cleaning in the same way.
D. It is essential to rinse the shower head and container following the acid stage
BEFORE immersing. Failure to do so will result in DANGEROUS GASES
being given off.
E. Take care to avoid splashes of both solutions.
F. Care should be taken with metal finished components as prolonged contact
with either solution may tarnish them.