Pool pH Adjusters

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Pool Chemicals & Testing
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556 results

ClearWater Pool & Lay-Z-Spa Treatment, Chemicals Starter Kit Set Swimming Pool
Brand new · ClearWater
(89)
£18.85
Free postage
1,861 sold
PH Increaser 1KG PH Plus Hot Tub Swimming Pool Spa Water Treatment Blue Sparkle
Brand new · Shatchi
(4)
£9.19
Free postage
574 sold
pH Increaser Granules, pH PLUS 1Kg for Swimming Pools, Hot Tubs & Spas aBalchemy
Brand new
£7.90
(£7.90/kg)
Free postage
99 sold
50x20g Chlorine Tablets Pool Hot Tub Spa + Dispenser + Testing strips FULL KIT!
24 Hour for Next Day Delivery
Brand new · Premier
(155)
£15.99
Free postage
20,134 sold
pH Increaser Granules, pH PLUS 5Kg for Swimming Pools, Hot Tubs & Spas aBalchemy
Brand new
£13.99
(£2.80/kg)
Free postage
70 sold
pH Plus Increaser 5kg Swimming Pool Chemicals & Spa
Brand new · Bluewater Pool & Spa Chemicals
(44)
£15.95
Free postage
8,186 sold
7kg pH Minus pH Reducer - Swimming Pool & Spa Chemicals
Brand new · Bluewater
(22)
£16.25
Free postage
3,166 sold
SUDS-ONLINE 5KG pH Plus (Increaser) for Swimming Pools, Spas and Hot Tubs
Brand new
(11)
£14.95
Free postage
1,055 sold
Hot Tub PH Increaser PH+
Brand new
£7.50 to £17.99
Free postage
242 sold
Bestway Clearwater Chemicals Swimming Pool Spa Hot Tub Chlorine Starter Kits
Brand new · ClearWater
£18.85
Free postage
150 sold
Hexeal pH PLUS | 1kg Jar | pH + Increaser for Swimming Pools, Spas, Hot Tubs
Brand new
£7.99
(£7.99/kg)
Free postage
677 sold
PoolSan pH Minus pH reducer and alkalinity reducer 400gr for pools & hot tubs
Brand new
£6.99
Free postage
68 sold
4 x Aquasparkle Spa Fusion Shock Treatment Hot Tub Pool Tubs Spas Oxidiser Lite
Brand new
(35)
£16.73
Free postage
536 sold
50 Chlorine Tablets + Dispenser + Testing strips Kit for Hot Tub Spa jacuzzi
Brand new · Premier
(15)
£15.99
Free postage
1,522 sold
20g CHLORINE TABLETS 5 IN 1 Multifunction SWIMMING POOL HOT TUB SPA
50 Tab Tubs inc FREE FLOATING DISPENSER
Brand new
£7.89 to £14.99
Free postage
475 sold
PH MINUS REDUCER DECREASER 1.5KG Hot Tub Chemicals Spa Swimming Pool Water
Brand new
(6)
£10.99
Free postage
356 sold
Aqua Sparkle Range Hot Tub Chemicals Disinfectant Sanitisers Balancers Cleaners
Brand new
(51)
£6.49 to £26.99
Free postage
64 sold
Swimming Pool Hot Tub Chemical Water Cleaner Starter Treatment Kit - 500G
Brand new · Suds-Online
(17)
£19.95
Free postage
1,496 sold
Hexeal pH MINUS | 1.5kg Jar | pH - Reducer for Swimming Pools, Spas, Hot Tubs
Brand new
£8.99
(£5.99/kg)
Free postage
113 sold
Clearwater pH Plus Increaser Hygienic Pool & Hot Tub Chemicals pH+ CH0005 - 1kg
Brand new · ClearWater
(65)
£11.95
(£10.86/kg)
Free postage
Hexeal pH PLUS | 5kg Bottle | pH + Increaser for Swimming Pools, Spas, Hot Tubs
Brand new
£14.75
(£2.95/kg)
Free postage
1,744 sold
NEW! Aquasparkle PH+ Up Plus 1Kg Hot Tub Swimming Pool Spa Soda Ash Increase
Brand new · AquaSparkle
(6)
£10.90
Free postage
880 sold
Bestway Clearwater Spa Starter Kit Chlorinating Granules, pH Adjuster - CH0018
Brand new · ClearWater
£19.85 to £37.85
Free postage
PH MINUS 7KG / DRY ACID REDUCER - SWIMMING POOL SPA HOT TUB CHEMICALS SUDS
Brand new
(2)
£15.95
Free postage
728 sold
NEW! Aquasparkle 1kg Non-Chlorine Shock Granules Hot Tub Spa Swimming Pool
Brand new
(51)
£19.99
Free postage
4,305 sold
7KG pH Reducer (pH Minus) for Swimming Pools, Spas and Hot Tubs
Brand new
£15.95
Free postage
120 sold
Sodium Bisulphate 25KG bag pH Minus Dry Acid Food Grade - CHEAP - FAST DELIVERY
Brand new
£38.00
Free postage
233 sold
Fi-clor Swimming Pool pH & Alkalinity Reducer (Dry Acid) 7kg
Brand new
£25.95
Free postage
pH Minus pH Reducer 1.5KG Hot Tub Chemicals Spa Swimming Pool Water Balancer
Brand new
£13.99
(£9.33/kg)
Free postage
107 sold
1KG pH+ Plus pH Increaser Chemicals MSPA Hot Tub Swimming Pool Water Treatment
Brand new · Shatchi
(4)
£9.19
Free postage
547 sold
CLEARWATER SWIMMING SPA HOT TUB TREATMENT STARTER CHEMICAL KIT
Brand new · ClearWater
(89)
£20.99
(£20.99/Unit)
Free postage
946 sold
ClearWater Swimming Pool and Hot Tub Chemical Starter Kit
New (other) · ClearWater
(89)
£10.78
£5.64 P&P
9 watching
Clearwater 1Kg Ph Increaser for Hot Tubs and Pools
Brand new · ClearWater
(65)
£10.99
Free postage
Non-Chlorine Shock Granules Aquasparkle Hot Tub Spa Pool Oxidiser 1kg
Brand new
(51)
£19.99
Free postage
109 sold
Hot Tub PH Decreaser PH-
Brand new
£7.50 to £17.99
Free postage
65 sold
Lay z Spa Floating Dispenser for 20g Tablets Spa Hot tub 5 inch
Brand new
(30)
£7.16
Free postage
440 sold
pH Plus Increaser 5kg Swimming Pool Chemicals & Spa
Brand new
£15.95
Free postage
213 sold
3x Clearwater pH Plus Increaser Hygienic Pool Hot Tub Chemicals pH+ CH0005 - 1kg
Brand new · ClearWater
£27.45
(£24.95/kg)
Free postage
Bestway Clearwater Chemicals Swimming Pool Spa Hot Tub Chlorine Starter Kits
Brand new · ClearWater
(4)
£320.85
Free postage
42 sold
50x20g Chlorine Tablets for Pools, Hot Tubs, Spas + **10 Testing strips**
Brand new · Premier
(8)
£14.49
Free postage
NEW! TA+ Alkalinity Plus 1Kg Raiser for Swimming Pool Hot tub Spa Increaser
Brand new · AquaSparkle
(14)
£12.99
Free postage
193 sold
5kg pH plus increaser hot tub lay-z spa pools high quality PH+ - CHEAPEST
Brand new
£14.70
Free postage
1,891 sold
Lay Z Spa Starter Kit 12 Filters, Algaecide, Chlorine, pH+, pH-, Foam, Clarifier
Brand new · ClearWater
£10.99
Free postage
500g pH plus increaser hot tub lay-z spa pools high quality PH+
Brand new
£6.99
Free postage
142 sold
Hexeal pH PLUS | 25kg Bag | pH + Increaser for Swimming Pools, Spas, Hot Tubs
Brand new
£39.99
(£1.60/kg)
Free postage
71 sold
NEW! PH - Minus Reducer Aquasparkle Hot tub Spa Pool Decreaser 1.5kg
Brand new · AquaSparkle
(11)
£10.78
Free postage
485 sold
Canadian Spa Company Grand Rapids Swimming Pool, Spa & Hot Tub Chemicals Kit
Brand new · Canadian Spa
(8)
£24.95
Free postage
85 sold
Ph Plus Ph Minus Increaser Decreaser Ph adjustable Kit Swimming Pool Hot Tub Spa
Brand new
£13.89 to £49.99
(£49.99/kg)
Free postage
Blue Horizons Swimming Pool Ph Plus - 5kg
Brand new
£25.95
Free postage
Only 2 left
Hexeal pH PLUS | 5kg Bucket | pH + Increaser for Swimming Pools, Spas, Hot Tubs
Brand new
£14.75
(£2.95/kg)
Free postage
1,051 sold
500g pH minus decreaser hot tub lay-z spa pools high quality PH -
Brand new
£7.99
Free postage
Chlorine Bromine Floating Dispenser for Spas Hot tubs Pools 5" 20g Tablet
Brand new
£8.28
Free postage
3,600 sold
pH Plus ph increaser pH Minus pH Decreaser SET Water Level Free UK PP
Brand new
£11.99
Free postage
ClearWater Lay-Z-Spa Swimming Pool Hot Tub Chemicals Accessories Starter Kits
Brand new · ClearWater
£1.25 to £26.40
Free postage
486 sold
Ultimate Chlorine Hot Tub Chemical Starter Kit - All You Need
Brand new
£44.00
Free postage
54 sold
pH & Total Alkalinity (TA) Water balancing Bundle
Brand new
£22.99
Free postage
SUDS ONLINE SWIMMING POOL CHEMICALS- CHLORINE TABLETS GRANULES ALGAECIDE LIQUID
Brand new · Suds-Online
£5.36 to £49.46
Free postage
Swimming Pool Hot Tub Chemical Water Cleaner Starter Treatment Kit - 1KG
Brand new · Suds-Online
(9)
£25.16
Free postage
211 sold
Bestway Clearwater Spa Starter Kit Chlorinating Granules, pH Adjuster - CH0018
Brand new · ClearWater
(4)
£20.99
Free postage
824 sold
50 x 20g Chlorine Tablets: HotTub Pool Spa
FREE FLOATING DISPENSER WITH ALL ORDERS
Brand new
£17.99
Free postage
77 sold

Best selling

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Top-rated

See all

Clearwater CH0019 1kg Multifunction Mini Tablets - White 7cm
(280)

94% agree - Would recommend
£14.99 New
50x20g Chlorine Tablets Pool Hot Tub Spa Dispenser Testing Strips Full Kit
(155)

98% agree - Would recommend
£15.99 New
ClearWater Swimming Pool and Hot Tub Chemical Starter Kit
(89)

100% agree - Would recommend
£18.85 New
£7.79 Used
Clearwater CH0007 1 Litre Swimming Pool and Spa Foam Remover
(86)

97% agree - Would recommend
£13.99 New
ClearWater CH0005 Increaser for Swimming Pool and Spa Treatment
(65)

100% agree - Would recommend
£4.99 New
Aquasparkle Non Chlorine Shock 1Kg for Hot Tub Spa Swimming Pool Chemicals
(51)

97% agree - Would recommend
£19.99 New
Quality Happy Hot Tubs Ph Plus 5kg Tub Spa Swimming Pool Soda Ash Spas Raiser
(32)

100% agree - Would recommend
£18.70 New
Bluewater Granules pH Adjuster - 7kg
(22)

94% agree - Would recommend
£16.25 New

Pool pH Adjusters

Shop by category

556 results

ClearWater Pool & Lay-Z-Spa Treatment, Chemicals Starter Kit Set Swimming Pool

PH Increaser 1KG PH Plus Hot Tub Swimming Pool Spa Water Treatment Blue Sparkle

pH Increaser Granules, pH PLUS 1Kg for Swimming Pools, Hot Tubs & Spas aBalchemy

50x20g Chlorine Tablets Pool Hot Tub Spa + Dispenser + Testing strips FULL KIT!

pH Increaser Granules, pH PLUS 5Kg for Swimming Pools, Hot Tubs & Spas aBalchemy

pH Plus Increaser 5kg Swimming Pool Chemicals & Spa

7kg pH Minus pH Reducer - Swimming Pool & Spa Chemicals

SUDS-ONLINE 5KG pH Plus (Increaser) for Swimming Pools, Spas and Hot Tubs

Hot Tub PH Increaser PH+

Bestway Clearwater Chemicals Swimming Pool Spa Hot Tub Chlorine Starter Kits

Hexeal pH PLUS | 1kg Jar | pH + Increaser for Swimming Pools, Spas, Hot Tubs

PoolSan pH Minus pH reducer and alkalinity reducer 400gr for pools & hot tubs

4 x Aquasparkle Spa Fusion Shock Treatment Hot Tub Pool Tubs Spas Oxidiser Lite

50 Chlorine Tablets + Dispenser + Testing strips Kit for Hot Tub Spa jacuzzi

20g CHLORINE TABLETS 5 IN 1 Multifunction SWIMMING POOL HOT TUB SPA

PH MINUS REDUCER DECREASER 1.5KG Hot Tub Chemicals Spa Swimming Pool Water

Aqua Sparkle Range Hot Tub Chemicals Disinfectant Sanitisers Balancers Cleaners

Swimming Pool Hot Tub Chemical Water Cleaner Starter Treatment Kit - 500G

Hexeal pH MINUS | 1.5kg Jar | pH - Reducer for Swimming Pools, Spas, Hot Tubs

Clearwater pH Plus Increaser Hygienic Pool & Hot Tub Chemicals pH+ CH0005 - 1kg

Hexeal pH PLUS | 5kg Bottle | pH + Increaser for Swimming Pools, Spas, Hot Tubs

NEW! Aquasparkle PH+ Up Plus 1Kg Hot Tub Swimming Pool Spa Soda Ash Increase

Bestway Clearwater Spa Starter Kit Chlorinating Granules, pH Adjuster - CH0018

PH MINUS 7KG / DRY ACID REDUCER - SWIMMING POOL SPA HOT TUB CHEMICALS SUDS

NEW! Aquasparkle 1kg Non-Chlorine Shock Granules Hot Tub Spa Swimming Pool

7KG pH Reducer (pH Minus) for Swimming Pools, Spas and Hot Tubs

Sodium Bisulphate 25KG bag pH Minus Dry Acid Food Grade - CHEAP - FAST DELIVERY

Fi-clor Swimming Pool pH & Alkalinity Reducer (Dry Acid) 7kg

pH Minus pH Reducer 1.5KG Hot Tub Chemicals Spa Swimming Pool Water Balancer

1KG pH+ Plus pH Increaser Chemicals MSPA Hot Tub Swimming Pool Water Treatment

CLEARWATER SWIMMING SPA HOT TUB TREATMENT STARTER CHEMICAL KIT

ClearWater Swimming Pool and Hot Tub Chemical Starter Kit

Clearwater 1Kg Ph Increaser for Hot Tubs and Pools

Non-Chlorine Shock Granules Aquasparkle Hot Tub Spa Pool Oxidiser 1kg

Hot Tub PH Decreaser PH-

Lay z Spa Floating Dispenser for 20g Tablets Spa Hot tub 5 inch

pH Plus Increaser 5kg Swimming Pool Chemicals & Spa

3x Clearwater pH Plus Increaser Hygienic Pool Hot Tub Chemicals pH+ CH0005 - 1kg

Bestway Clearwater Chemicals Swimming Pool Spa Hot Tub Chlorine Starter Kits

50x20g Chlorine Tablets for Pools, Hot Tubs, Spas + **10 Testing strips**

NEW! TA+ Alkalinity Plus 1Kg Raiser for Swimming Pool Hot tub Spa Increaser

5kg pH plus increaser hot tub lay-z spa pools high quality PH+ - CHEAPEST

Lay Z Spa Starter Kit 12 Filters, Algaecide, Chlorine, pH+, pH-, Foam, Clarifier

500g pH plus increaser hot tub lay-z spa pools high quality PH+

Hexeal pH PLUS | 25kg Bag | pH + Increaser for Swimming Pools, Spas, Hot Tubs

NEW! PH - Minus Reducer Aquasparkle Hot tub Spa Pool Decreaser 1.5kg

Canadian Spa Company Grand Rapids Swimming Pool, Spa & Hot Tub Chemicals Kit

Ph Plus Ph Minus Increaser Decreaser Ph adjustable Kit Swimming Pool Hot Tub Spa

Blue Horizons Swimming Pool Ph Plus - 5kg

Hexeal pH PLUS | 5kg Bucket | pH + Increaser for Swimming Pools, Spas, Hot Tubs

500g pH minus decreaser hot tub lay-z spa pools high quality PH -

Chlorine Bromine Floating Dispenser for Spas Hot tubs Pools 5" 20g Tablet

pH Plus ph increaser pH Minus pH Decreaser SET Water Level Free UK PP

ClearWater Lay-Z-Spa Swimming Pool Hot Tub Chemicals Accessories Starter Kits

Ultimate Chlorine Hot Tub Chemical Starter Kit - All You Need

pH & Total Alkalinity (TA) Water balancing Bundle

SUDS ONLINE SWIMMING POOL CHEMICALS- CHLORINE TABLETS GRANULES ALGAECIDE LIQUID

Swimming Pool Hot Tub Chemical Water Cleaner Starter Treatment Kit - 1KG

Bestway Clearwater Spa Starter Kit Chlorinating Granules, pH Adjuster - CH0018

50 x 20g Chlorine Tablets: HotTub Pool Spa

Best selling

Clearwater CH0019 1kg Multifunction Mini Tablets - White 7cm

Clearwater 1L Algaecide Chemical Swimming Paddle Pool Lay Z Spa Hot Tub

ClearWater Swimming Pool and Hot Tub Chemical Starter Kit

ClearWater CH0005 Increaser for Swimming Pool and Spa Treatment

Bluewater Granules pH Adjuster - 7kg

50x20g Chlorine Tablets Pool Hot Tub Spa Dispenser Testing Strips Full Kit

Clearwater CH0007 1 Litre Swimming Pool and Spa Foam Remover

Aquasparkle Non Chlorine Shock 1Kg for Hot Tub Spa Swimming Pool Chemicals

Top-rated

Clearwater CH0019 1kg Multifunction Mini Tablets - White 7cm

50x20g Chlorine Tablets Pool Hot Tub Spa Dispenser Testing Strips Full Kit

ClearWater Swimming Pool and Hot Tub Chemical Starter Kit

Clearwater CH0007 1 Litre Swimming Pool and Spa Foam Remover

ClearWater CH0005 Increaser for Swimming Pool and Spa Treatment

Aquasparkle Non Chlorine Shock 1Kg for Hot Tub Spa Swimming Pool Chemicals

Quality Happy Hot Tubs Ph Plus 5kg Tub Spa Swimming Pool Soda Ash Spas Raiser

50x20g Chlorine Tablets for Pools, Hot Tubs, Spas + 10 Testing strips