Tools

Litres from shape and dimensions — the number every dose starts from.

Freeform pools use a 0.89 shape factor. Round up when dosing sanitiser down.

Salt to add to reach chlorinator operating range.

Check the chlorinator's rated range — targets vary by model. 1 ppm = 1 mg/L.

Is the water balanced, corrosive or scale-forming?

Carbonate alkalinity = TA − CYA/3. TDS constant per the ANSI/APSP-11 table. Balanced band ±0.3. About scale and the LSI

Which Sensaheat suits this pool, how long it takes to bring up, and what it costs to run.

A full month-by-month heat balance for WA conditions — Perth, the South West, Mid West, Great Southern, Goldfields and Pilbara. Set the pool, the blanket and the run time, and it names the unit.

• Recommended Sensaheat model across the TDX, PiX and ES series
• Heat-up time and running cost, month by month
• What a blanket is worth on that pool, in dollars and in kW

Annual running-cost difference when swapping the pump.

Assumes the same run hours year-round. Variable-speed pumps often allow longer, slower runs — savings shown are conservative.