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Elements and Performance Criteria

1. Perform measurements relating to swimming pool and spa servicing.
   • Measurement requirements are confirmed.
   • Preparations for measurement tasks are implemented.
   • Measurements are obtained and confirmed using established work practices, measuring equipment, and personal protective equipment (PPE) to ensure safety and security of self, others and property.
   • Measurements are recorded using correct measurement units.
   • Measurement units are converted as required.
   • Measuring equipment and materials are cleaned, checked for serviceability, calibrated, maintained and stored.
   • Environmental impact of measurement activities is minimised and waste is disposed of in line with enterprise procedures.
2. Perform calculations relating to swimming pool and spa servicing.
   • Calculation requirements are confirmed and correct method is selected for achieving required result.
   • Calculations are performed using online and electronic calculators as required, and results are confirmed and recorded.
   • Results of calculations are interpreted to solve problems relating to swimming pool and spa servicing.
3. Interpret mathematical information.
   • Information represented in symbols, diagrams and pictorial representations is recognised and interpreted to complete workplace tasks.
   • Limitations of swimming pool and spa measurements and calculations, and associated risks, are identified.

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.
Measurement requirementsmust include:	flow and turnover rates swimming pool or spa chemical quantities swimming pool or spa dimensions: area perimeter volume temperatures weights.
Calculation requirements must include:	chemical quantities required to improve water quality: dry liquid flow and turnover rates mass quantity surface area and perimeter of swimming pools and spas: irregular shapes regular shapes time to fill or empty swimming pools or spas volume of swimming pools or spas: constant slope flat bottom multi-depth multi-depth circular water loss and make-up water weight.

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Performance Evidence

A person demonstrating competency in this unit must satisfy the requirements of the elements, performance criteria, foundation skills and range of conditions of this unit.

The person must also:

calculate the area, perimeter and volume of one regular and one irregular shaped swimming pool or spa with sloped pool floors

calculate water loss in one swimming pool or spa

calculate the quantity of pool chemicals required to improve water quality in one swimming pool or spa

calculate flow and turnover rates and time taken to fill and empty one swimming pool or spa.

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Knowledge Evidence

A person demonstrating competency in this unit must demonstrate knowledge of:

calculation methods:

flow rate

limitations

mass

perimeter

quantity

risks

surface area

time

turnover rate

volume

water loss and make-up water

weight

conversion of measurement units:

metric system conversions

metric to imperial measurement unit conversion and vice versa

graphical representations of mathematical information:

diagrams

graphs

symbols

measurements:

hazards, risks and enterprise safety procedures associated with measurements undertaken on site

limitations

measurement-recording procedures

measurement units

need for accuracy of measurements

purpose of measurements

types and function of measuring equipment

swimming pool and spa:

dimensions

pool floor configurations

shapes

water loss in swimming pools and spas:

evaporation

planned dilution:

total dissolved solids (TDS) level

user load

plumbing and shell leaks

user splash-out and drag-out.

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