Hot Tub pH Balancing Controls and More

The potential issues of having unbalanced alkaline levels in your hot tub water are that it can have an adverse effect on your hot tub's appearance, cause knock-on problems to your pH readings and even affect your skin.

High pH readings on the other hand can cause scale build upon your hot tub components and deposits on the surface of your spa, can contribute to the appearance of cloudy, dull, or even foaming water and affect the efficiency of your water sanitizer which in turn adds risk to your friends and family using your hot tub.

Recommendations for addressing high levels of pH and alkalinity.

When it comes to balancing the pH and alkalinity of your hot tub water, they follow the same principles; if your levels are low, use a plus increaser and a Total Alkalinity Increaser, always remember the rule of thumb and balance your Total Alkalinity first, then your pH, if your levels are too high, use a pH & Alkalinity Reducer or Minus product!

If your alkalinity is too high, we would recommend that you… use a combined pH & Alkalinity Reducer as typically if your water is either high in pH or naturally high pH from the source then your Alkalinity normally follows suit.

If your pH is too high, we would recommend that you…. use a combined pH & Alkalinity Reducer as typically if your water is either high in Alkalinity or naturally high TA from the source then your pH normally follows suit.

To ensure that you get the right hot tub chemistry, remember the rule of thumb, and always balance your alkalinity before you address any issues with your pH readings.

The water Alkalinity or Total Alkalinity (TA) of your hot tub is a measurement of how your water is able to neutralize acids and as such is a key component to the balancing of your pH levels. The alkalinity levels act as a buffer to help your water resist drastic changes. If the alkalinity of your water is unbalanced, it can cause the pH readings to be either too high or too low. The alkalinity of your hot tub should be between 80 to 120ppm.

pH on the other hand is a measurement of how acidic or alkaline your water is. The ideal range for pH in your hot tub water is between 7.2 and 7.8, as this will allow the chlorine in your water to work more effectively at keeping your water clean. We would recommend that you check the pH level of your water a minimum of twice a week as sanitizers and minerals in the water can have an impact on your reading.

Spa Hardness Increaser 1kg, 78-GYCO-QYHS

This product should be used to raise the calcium hardness levels in Spa and Hot Tub water. If there is insufficient levels of calcium in the water it may be difficult to balance the water and grout loss within tiled spas may occur.


1. Take a CALCIUM HARDNESS reading with a quality test kit. The correct reading is a minimum of 250PPM (mg/l)

2. Dose at a rate of 10g of Calcium Hardness Increaser to 1,000 litres (220 gallons) of water. Each dose will raise Calcium Hardness by approximately 10PPM (mg/l) and add no more than 50g at any one time.

3. With the circulation running, sprinkle the product directly to the water; DO NOT PRE-DISSOLVE

4. Bathing may recommence when all product has been dissolved.


• Always ensure bathers are out of the water when adding chemicals.

• Never mix with any other chemicals including cleaning products, weed killers and chlorine products, as a dangerous reaction may occur.

• Always handle products in a well-ventilated area.

• Always wash hands thoroughly after handling chemicals.

• Store in a cool, dry, well ventilated, secure place. Ensure chemicals do not become damp in storage.

• Instructions and dosages given are a guide to most effective use.


• This container must not be used or contaminated with any other materials.

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Spa Hardness Increaser 1kg

  • Brand: SpaChem
  • Product Code: SpaChem
  • Availability: 21
  • £14.12
  • £11.12

  • Ex Tax: £9.27

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Tags: Water Hardness Increaser, Calcium Hardness Increaser, Total Hardness Increaser

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