Home Chemicals View All Chemicals pH Minus (1.5kg)
ph minus reducer for lay z spa hot tubs
hot tub ph reducer granules
total alkalinity reducer for hot tubs
clearwater ph minus

pH Minus (1.5kg)

SKU: CH0008-1
Sale price £12.99
In Stock
  • Fast dissolving pH reducing granules
  • Reduces pH levels in pools and hot tubs
  • Also used to reduce high Total Alkalinity 
  • Helps maintain comfortable water conditions and protect equipment
  • Enables chlorine treatment to work more effectively
3 For 2 On Hot Tub Chemicals and Accessories

Enjoy even more savings when ordering directly from Lay-Z-Spa.co.uk

With our 3 For 2 offer across Lay-Z-Spa accessories and Clearwater chemicals, you can accessorise for a bit of luxury and grab those essential hot tub chemicals and save.

Add at least 3 chemicals or accessories to your basket and receive the cheapest item free.

Terms and conditions

 Free Express Delivery | Bank Holiday Offer
Enjoy more time to relax this bank holiday with free express delivery on any orders over £20. 

To make the most of the long bank holiday weekend, we're offering Free Express Delivery worth £19.99 on any order over £20, so you can relax knowing your new hot tub will arrive in time for that well-deserved you time*. 

Select your preferred delivery option at checkout, and we'll do the rest.
*T&Cs apply. Check our Deliveries page. Please note, this service is only available for select regions in the UK. If this option does not show at checkout, we unfortunately cannot ship to your address at this time. Some products are excluded from this offer.

Offer Ends 10 am, 30th April 2026.

Read our full terms & conditions here.
FREE Express Delivery

On orders above £20. Usually delivered within 2 working days.

FREE Standard Shipping

On orders above £20. Usually delivered within 2-4 working days.

Product Details

What is Clearwater® pH Minus for?

ClearWater pH Minus is the best way to decrease a hot tub's pH levels if they are higher than 7.6. The pH decreaser is also used to bring down Total Alkalinity levels.

Incorrect pH and Total Alkalinity levels can impact the water quality and the experience for the user and results in chlorine imbalances.

The recommended pH balance is between 7.2 and 7.6. When pH levels rise above 7.6 in a pool or hot tub, a pH reducer is needed.

How does pH minus work?

ClearWater pH Minus contains chemical acid that neutralises some alkaline compounds and lowers pH, preventing scale, cloudiness, discomfort and poor chlorine performance.

Clearwater pH Minus - Quick Start Guide:

Step 1: Test water. If pH levels or Total Alkalinity are too high, use pH Minus

Step 2: Measure the quantity you need (refer to the label). 1g of pH minus per 100L of water to lower pH by 0.1

Step 3: Dissolve pH granules in a container of warm water. Pour dissolved mixture into the hot tub.

Step 4: Run the filter and leave for 4hrs. Retest and repeat if needed.

As with all chemical products, time should be taken carefully read through instructions and warnings before using.

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