7kg Castle Hot Tubs pH Minus


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SKU: CHBAOL-07K-PHMI01-1 Categories: , , Tags: , ,


Use 7kg Castle Hot Tubs pH Minus to reduce the pH level in your hot tub, spa or swimming pool.

pH is a measure of how acidic or how basic water is. The pH range goes from 0 to 14, with 7 being neutral. A pH of less than 7 indicates acidity, a pH of greater than 7 indicates a base. The pH of water is a very important measurement concerning the water quality of your hot tub / spa or swimming pool.

A high PH level in a pool or hot tub water can cause limescale build up, which can damage working parts including pumps, heaters and seals.

To prevent this issue, bring the PH to between 7.2 and 7.4 on your test kit/strips.

You can test your water one of three methods:


Confused about your hot tub water chemistry?

Our guides answer the most Frequently Asked Questions!

Read our how-to guide on balancing your hot tub / spa / swimming pool water pH levels.


We make every attempt to despatch goods as soon as payment is received. Goods ordered before 1pm will be sent out on the same day. Our couriers deliver from MON-FRI anything ordered at weekends or bank holidays will be posted on the following working day.

If you require delivery to the Scottish Highlands & Islands, Isle of Man, Scilly Isles, Channel Islands, Northern Ireland or outside of the UK mainland please contact us for a postal quote before making your purchase. Thank you.