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pH Down - Twist & Dose


$18.00 inc GST

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Dry Acid - Lowers pH and total alkalinity in pool and spas.

Essential for swimmer comfort.

Safer to use than liquid acid.

Active constituent: 1000 gm/kg Sodium Bisulphate

Available in 2 sizes. Please call for other sizes.

3 kg: $18.00
6 kg: $29.00


Dosage Rates:

  • To decrease the Total Alkalinity by 10ppm in 25,000 Litres add 375 grams
  • To decrease the Total Alkalinity by 10ppm in 50,000 Litres add 750 grams
  • pH Down should be pre-dissolved in a bucket of water



  • Zodiac pH Down is prescribed by the TWIST top yellow ring when the Total Alaklinity level is above 150ppm and /or by the TWIST middle yellow ring when pH is above 7.8.
  • Simply use purple colour-coded measuring jug and scoop supplied with TWIST & DOSE Pool Health kit to dose exact quantity of pH Down prescribed by the TWIST.
  • Rinse scoop and jug after each use.
  • Make sure the pump is on before dosing.
  • Dissolve dosage in a bucket of pool and apply the solution evenly around the edges of the pool. Run your pump for at least 2 hours following treatment.


  • To decrease the Total Alkalinity by 10ppm in 25,000 Litres, add 375g.
  • To decrease Total Alaklinity by 10ppm in 50,000 Litres, add 750g.

pH Down should be pre-dissolved in a bucket of water. Always add chemicals to water, NOT water to chemicals.

Dosage rates are a guide only. Please refer to the label for further instructions

Office hours: 9am - 5pm Mon-Fri. 9am - 3pm Sat. & Sun. 

Ph: 1800 648 363 or 02 4956 5694... Tap to Call Us on your Mobile Now!


Skype: directpoolsupplies

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2/28 Pendlebury Road Cardiff 2285 ABN: 77 069 817 769 Ph: 02 4956 5694



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