Best Selling Products

Our Best Selling Products category features the most popular and trusted water testing solutions chosen by professionals and everyday users alike. From quick and easy test kits to advanced meters and reagents, these products have earned their place as customer favourites for their reliability, accuracy, and ease of use. Whether you’re testing pool water, drinking water, or industrial systems, these top picks deliver the dependable results you can count on.

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4196 products

HACH Silica Reagent Set, 1-100 mg/L SiO₂
HACH
HACH Silica Reagent Set, 1-100 mg/L SiO₂ Sale price£218.00
LaMotte Insta-Test 5
LaMotte
LaMotte Insta-Test 5 Sale price£10.44
VWR
Bottle 1000 mL Square PET Sterile 20 mg/L Sodium Thiosulfate Red Cap / 1 * 84 items Sale price£195.00
HACH Silica Reagent Set, 0.010-1.600 mg/L SiO₂
HACH
HACH Silica Reagent Set, 0.010-1.600 mg/L SiO₂ Sale price£145.00
HACH Molybdate 3 reagent solution, 100 mL
HACH
HACH Molybdate 3 reagent solution, 100 mL Sale price£38.00
HACH Citric Acid F Reagent Solution, 100 mL MDB
HACH
HACH Citric Acid F Reagent Solution, 100 mL MDB Sale price£35.00
HACH Amino Acid F Reagent Powder Pillows, 25ml, pk/100
HACH
HACH Amino Acid F Reagent Powder Pillows, 25ml, pk/100 Sale price£52.00
Save £3.76
Lovibond CHECKIT Disc Chlorine DPD 0 - 2 mg/L Cl2
Lovibond
Lovibond CHECKIT Disc Chlorine DPD 0 - 2 mg/L Cl2 Sale price£25.16 Regular price£28.92
HACH DPD Free Chlorine Reagent, SwifTest™ Dispenser Refill Vial, 250 TestsHACH DPD Free Chlorine Reagent, SwifTest™ Dispenser Refill Vial, 250 Tests
HACH
HACH DPD Free Chlorine Reagent, SwifTest™ Dispenser Refill Vial, 250 Tests Sale price£72.50
HACH DPD Total chlorine, Swiftest dispenser reagent (refill)HACH DPD Total chlorine, Swiftest dispenser reagent (refill)
HACH
HACH DPD Total chlorine, Swiftest dispenser reagent (refill) Sale price£74.30
Swiftest DPD Total chlorine reagent dispenser and reagent vialSwiftest DPD Total chlorine reagent dispenser and reagent vial
TEST ALL WATER
Swiftest DPD Total chlorine reagent dispenser and reagent vial Sale price£159.00
DPD Free Chlorine Reagent, SwifTest™ DispenserDPD Free Chlorine Reagent, SwifTest™ Dispenser
Hach
DPD Free Chlorine Reagent, SwifTest™ Dispenser Sale price£157.00
Save £7.86
Lovibond W100.OG.40mm Cell
Lovibond
Lovibond W100.OG.40mm Cell Sale price£52.61 Regular price£60.47
Save £13.25
Lovibond Vario Phosphonate Reagent
Lovibond
Lovibond Vario Phosphonate Reagent Sale price£88.64 Regular price£101.89
IDEXX UV Viewer PLUS
IDEXX
IDEXX UV Viewer PLUS Sale price£1,481.95
LaMotte 2020t/i Portable Turbidity Meter
LaMotte
LaMotte 2020t/i Portable Turbidity Meter Sale price£1,343.25
Aquarium Free Chlorine 3, 50 strips/pk Test All WaterAquarium Free Chlorine 3, 50 strips/pk Test All Water
TEST ALL WATER
Aquarium Free Chlorine 3, 50 strips/pk Test All Water Sale price£3.78
Aquarium Phosphate 500, 50 strips/pk Test All WaterAquarium Phosphate 500, 50 strips/pk Test All Water
TEST ALL WATER
Aquarium Phosphate 500, 50 strips/pk Test All Water Sale price£5.04
Test All Water: Aquarium 7 in 1 Test Strips
TEST ALL WATER
Test All Water: Aquarium 7 in 1 Test Strips Sale price£7.84
CERT BLEACH TABLETSCERT BLEACH TABLETS
TEST ALL WATER
CERT BLEACH TABLETS Sale priceFrom £2.70
Kuntze Instruments
Kuntze Cloud Connect Remote Access System Sale price£501.84 Regular price£528.25
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HACH Nitrate 0 - 50 mg/L and Nitrite 0 - 3 mg/L Test Strips
Hach
HACH Nitrate 0 - 50 mg/L and Nitrite 0 - 3 mg/L Test Strips Sale price£19.57
Lovibond Refill Pack Scuba3s - Copper No.1
Lovibond
Lovibond Refill Pack Scuba3s - Copper No.1 Sale price£44.27
Lovibond Refill Pack Scuba3s - Hardness Calcium
Lovibond
Lovibond Refill Pack Scuba3s - Hardness Calcium Sale price£16.77

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