AquaSPArkle Spa pH Minus


AquaSPArkle Spa pH Minus- For reducing spa and hot tub pH & total alkalinity


AquaSPArkle Spa pH Minus New Price for 2024

Contains sodium hydrogen sulphate – all chlorine based sanitisers become less effective at killing bacteria and viruses as the pH rises ( becomes more alkaline).

Acid/Alkaline conditions are measured on the pH scale which ranges from 0 – 14. Ideal bathing conditions exist at a slightly alkaline level of 7.2 to 7.6 with Total Alkalinity of 80/140 mg/l (ppm).

Ideal pH Range: 7.2 – 7.6

Test the pH of your spa water and if it is above 7.6, use AquaSPArkle Spa pH Minus to lower it. Spa pH Minus can also be used for lowering Total Alkalinity if it rises above 150mg/l (ppm).


  1. Pre-dissolve the product in a clean plastic container at a maximum rate of 10g of product per 0.2 gallons (1ltr) of clean warm water.
  2. Stir well to ensure product is fully dissolved.
  3. Carefully add the resulting solution to the spa whilst the pump(s) are turned “on”. If you are reducing Total Alkalinity, pour the solution in one area in the middle of the spa.
  4. After a minimum of 30 minutes, recheck the pH/Total Alkalinity level and if necessary repeat the treatment until the ideal pH/Total Alkalinity is established.

Litres     Gallons      pH dose rates
1,000     220             11g
1,500      330            22g

Please note several doses may be required.

To lower total alkalinity: This product can also be used to lower total alkalinity (TA) but needs to be dosed differently. Pre-dissolve the product as above but apply the solution in one area in the middle of the hot tub with the circulation
turned “off”. After 15 minutes, turn the circulation “on”, allow to circulate for 15 minutes, then re-test and repeat dose if necessary.

Litres    Gallons            To lower TA by:                To lower TA by:
10mg/l                                25mg/l
1,000      220                 25g                                       63g
1,500       330                 38g                                       95g

Product Safety

Causes serious eye damage.


Take precautions: Causes serious eye damage.

Additional information

Weight 1.5 kg
Pack Size


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