communication skills to interact in an ethical manner with clients from diverse social, economic and cultural backgrounds decision-making and problem-solving skills to determine suitability of swimming pool or spa for acid washing literacy skills to read and interpret technical manuals and specifications related to draining and acid washing swimming pools and spas numeracy skills to perform calculations related to preparation of acid for acid washing of swimming pool or spa research skills to identify and locate technical information on acid washing materials, hazards and techniques technology skills to use tools and equipment associated with draining and acid washing swimming pools and spas Required knowledge acid washing of swimming pools and spas: causes of stain and mineral build-up on pool and spa surfaces dilution of acid discharge of the acid wash mix after acid washing the pool draining and acid washing procedure environmental impact frequency hydrostatic pressure impact on swimming pool or spa surface and structure: cracking, thinning or delamination of tiles and plaster plaster may shrink, expand, crack, blister, flake or pop off pool may raise out of the ground surface is etched, becomes rough or the aggregate in the plaster mix is exposed tiles may fall off the pool or spa uneven stain removal or surface finish neutralising acid purpose risks safe disposal of waste safety sanding suitability of swimming pools and spas waste water discharge acids: muriatic acid: alternative names handling, transportation and storage material safety data sheet properties safety neutralising personal protective equipment for working with acids properties safety: storage use waste work practices types chemical-safety principles and practices client disclosure and acknowledgement documentation: content purpose commonwealth, state or territory, and local government legislation and regulations, Australian standards and codes of practice impacting on draining and acid washing swimming pools and spas related to: chemical safety dangerous goods plumbing regulations controlling conduct of plumbing work environment protection environmental health work health and safety private and public swimming pools and spas waste disposal water testing: results techniques types of tests |