Hardness Chemistries


Hach, Core & Main, and LaMotte offer specialized hardness chemistries for water quality analysis, including reagents and test kits that measure calcium and magnesium concentrations using titration and colorimetric methods. These products support accurate field and lab testing with features like drop-count kits, digital titrators, and direct-reading burettes, helping users monitor total hardness in drinking water, wastewater, and environmental samples.

LaMotte Calcium Hardness TesTabs®, Pack of 100, 6846A-J
Quick View
LaMotte Calcium Hardness TesTabs®, Pack of 100, 6846A-J
$26.45

Mfr. Part # LaMotte 6846A-J

Product # 707898

LaMotte Hardness Reagent 6, 30 mL, 4485-G
Quick View
LaMotte Hardness Reagent 6, 30 mL, 4485-G
$13.25

Mfr. Part # LAMOTTE 4485-G

Product # 707865

LaMotte Hardness Reagent 5, 30 mL, 4483-G
Quick View
LaMotte Hardness Reagent 5, 30 mL, 4483-G
$13.95

Mfr. Part # LAMOTTE 4483-G

Product # 707864

Core & Main Hardness Standard as CaCO3, 1000 ppm, 1 L
Quick View
Core & Main Hardness Standard as CaCO3, 1000 ppm, 1 L
$55.35

Mfr. Part # HA7670-Q

Product # 707040

Core & Main Hardness Standard as CaCO3, 1000 ppm, 500 mL
Quick View
Core & Main Hardness Standard as CaCO3, 1000 ppm, 500 mL
$37.65

Mfr. Part # HA7670-P

Product # 707039

Core & Main Hardness Standard as CaCO₃, 100 ppm, 1 L
Quick View
Core & Main Hardness Standard as CaCO₃, 100 ppm, 1 L
$48.25

Mfr. Part # HA7630-Q

Product # 707038

Core & Main Hardness Standard as CaCO3, 100 ppm, 500 mL
Quick View
Core & Main Hardness Standard as CaCO3, 100 ppm, 500 mL
$29.55

Mfr. Part # HA7630-P

Product # 707037

Hach EDTA, Disodum Salt (TitraVer® Hardness Reagent), ACS Grade, 500 g, 20434
Quick View
Hach EDTA Disodum Salt TitraVer Hardness Reagent ACS Grade 500 g 20434
$136.00

Mfr. Part # 20434

Product # 700586

Hach EDTA, Disodum Salt (TitraVer® Hardness Reagent), ACS Grade, 100 g, 20426
Quick View
Hach EDTA Disodum Salt TitraVer Hardness Reagent ACS Grade 100 g 20426
$58.50

Mfr. Part # 20426

Product # 700585

Hach Rochelle Salt Solution, 500 mL, 172549
Quick View
Hach Rochelle Salt Solution, 500 mL, 172549
$116.00

Mfr. Part # 172549

Product # 700772

Hach EDTA Digital Titrator Cartridge, 0.1428 M, 1496001
Quick View
Hach EDTA Digital Titrator Cartridge, 0.1428 M, 1496001
$34.19

Mfr. Part # 1496001

Product # 701070

Hach EDTA Digital Titrator Cartridge, 0.714 M, 1495901
Quick View
Hach EDTA Digital Titrator Cartridge, 0.714 M, 1495901
$34.19

Mfr. Part # 1495901

Product # 701069

Hach CDTA Digital Titrator Cartridge, 0.800 M, 1440301
Quick View
Hach CDTA Digital Titrator Cartridge, 0.800 M, 1440301
$30.65

Mfr. Part # 1440301

Product # 701024

Hach CDTA Digital Titrator Cartridge, 0.0800 M, 1440201
Quick View
Hach CDTA Digital Titrator Cartridge, 0.0800 M, 1440201
$33.99

Mfr. Part # 1440201

Product # 701023

Hach CDTA Disodium Magnesium Salt, 100 g, 1408026
Quick View
Hach CDTA Disodium Magnesium Salt, 100 g, 1408026
$290.00

Mfr. Part # 1408026

Product # 700949

Hach CDTA Disodium Magnesium Salt Powder Pillows, pk/100, 1408099
Quick View
Hach CDTA Disodium Magnesium Salt Powder Pillows, pk/100, 1408099
$66.15

Mfr. Part # 1408099

Product # 700950

Hach Eriochrome Black T, Practical Grade, 25 g, 13224
Quick View
Hach Eriochrome Black T, Practical Grade, 25 g, 13224
$57.79

Mfr. Part # 13224

Product # 700561

Hach Hardness Reagent Set, Calmagite Colorimetric, 2319900
Quick View
Hach Hardness Reagent Set, Calmagite Colorimetric, 2319900
$126.00

Mfr. Part # 2319900

Product # 701432

Hach Hardness Buffer Solution, Aminoethanol, 500 mL, 2311149
Quick View
Hach Hardness Buffer Solution, Aminoethanol, 500 mL, 2311149
$41.59

Mfr. Part # 2311149

Product # 701416

Hach Alkali Buffer, 3.0 N, 100 mL, 2307242
Quick View
Hach Alkali Buffer, 3.0 N, 100 mL, 2307242
$28.95

Mfr. Part # 2307242

Product # 701406

Hach HNB Lab Reagent Package, 2307300
Quick View
Hach HNB Lab Reagent Package, 2307300
$60.99

Mfr. Part # 2307300

Product # 701407

Hach HNB Dilution Solvent, 100 mL, 2305042
Quick View
Hach HNB Dilution Solvent, 100 mL, 2305042
$18.80

Mfr. Part # 2305042

Product # 701402

Hach Hardness (Total) Reagent Set, Digital Titrator, Full Range, 2272000
Quick View
Hach Hardness (Total) Reagent Set, Digital Titrator, Full Range, 2272000
$107.00

Mfr. Part # 2272000

Product # 701371

Hach Hardness (Calcium and Total) Reagent Set, Digital Titrator, 2272100
Quick View
Hach Hardness (Calcium & Total) Reagent Set Digital Titrator 2272100
$184.00

Mfr. Part # 2272100

Product # 701372

Hach Alkali Solution, 500 mL, 2241749
Quick View
Hach Alkali Solution, 500 mL, 2241749
$82.70

Mfr. Part # 2241749

Product # 701317

Hach Calcium/Magnesium Indicator Solution, 500 mL, 2241849
Quick View
Hach Calcium/Magnesium Indicator Solution, 500 mL, 2241849
$91.45

Mfr. Part # 2241849

Product # 701319

Hach EGTA Solution, 50 mL SCDB, 2229726
Quick View
Hach EGTA Solution, 50 mL SCDB, 2229726
$36.75

Mfr. Part # 2229726

Product # 701308

Hach Calmagite Solution, 0.003%, 4 L, 2230356
Quick View
Hach Calmagite Solution, 0.003%, 4 L, 2230356
$123.00

Mfr. Part # 2230356

Product # 701309

Hach UniVer® 3 Hardness Reagent, 28 g, 21320H
Quick View
Hach UniVer 3 Hardness Reagent 28 g 21320H
$21.65

Mfr. Part # 21320H

Product # 702691

Hach Magnesium TNTplus Vial Test, 0.5 - 50 mg/L Mg , 25 Tests, TNT849
Quick View
Hach Magnesium TNTplus Vial Test, 0.5 - 50 mg/L Mg, 25 Tests, TNT849
$120.00

Mfr. Part # TNT849

Product # 700168

Hach Hardness (ULR) Reagent Set, Bulk Solution, 2603101
Quick View
Hach Hardness (ULR) Reagent Set, Bulk Solution, 2603101
$1,281.00

Mfr. Part # 2603101

Product # 701728

Hach Hardness (ULR) Reagent Set, Solution Pillows, 2603100
Quick View
Hach Hardness (ULR) Reagent Set, Solution Pillows, 2603100
$434.00

Mfr. Part # 2603100

Product # 701727

Hach Chlorophosphonazo Indicator Solution Pillows for ULR Hardness, pk/100, 2589599
Quick View
Hach Chlorophosphonazo Indicator Solution Pillows for ULR Hardness, pk/100, 2589599
$402.00

Mfr. Part # 2589599

Product # 701717

Hach CDTA Titrant (HexaVer™), 0.02 N, 1 L, 74053
Quick View
Hach CDTA Titrant (HexaVer) 0.02 N 1 L 74053
$52.69

Mfr. Part # 74053

Product # 700672

Hach CDTA Titrant (HexaVer™), 0.02 N, 4 L, 74056
Quick View
Hach CDTA Titrant (HexaVer) 0.02 N 4 L 74056
$101.00

Mfr. Part # 74056

Product # 700673

Hach Hardness (Calcium & Total Sequential) LR Reagent Set, Digital Titrator, 2448600
Quick View
Hach Hardness (Calcium & Total Sequential) LR Reagent Set, Digital Titrator, 2448600
$164.00

Mfr. Part # 2448600

Product # 701606

Hach Hardness (Calcium & Total Sequential) HR Reagent Set, Digital Titrator, 2448700
Quick View
Hach Hardness (Calcium & Total Sequential) HR Reagent Set, Digital Titrator, 2448700
$146.00

Mfr. Part # 2448700

Product # 701607

Hach Hardness Reagent Set (Calcium & Total), Buret, 0-2500 mg/L CaCO₃, 2448200
Quick View
Hach Hardness Reagent Set (Calcium & Total), Buret, 0-2500 mg/L CaCO₃, 2448200
$165.00

Mfr. Part # 2448200

Product # 701605

Hach Hardness (Total) Reagent Set, HR, Digital Titrator, 2448100
Quick View
Hach Hardness (Total) Reagent Set, HR, Digital Titrator, 2448100
$79.39

Mfr. Part # 2448100

Product # 701604

Hach Hardness (Total) Reagent Set, LR, Digital Titrator, 2448000
Quick View
Hach Hardness (Total) Reagent Set, LR, Digital Titrator, 2448000
$79.39

Mfr. Part # 2448000

Product # 701603

Hach Hardness (Total) Reagent Set, Buret, LR, 2447600
Quick View
Hach Hardness (Total) Reagent Set, Buret, LR, 2447600
$78.45

Mfr. Part # 2447600

Product # 701601

Hach Hardness (Calcium) Reagent Set, HR, Digital Titrator, 2447500
Quick View
Hach Hardness (Calcium) Reagent Set, HR, Digital Titrator, 2447500
$83.90

Mfr. Part # 2447500

Product # 701600

Hach Hardness (Calcium) Reagent Set, LR, Digital Titrator, 2447200
Quick View
Hach Hardness (Calcium) Reagent Set, LR, Digital Titrator, 2447200
$83.90

Mfr. Part # 2447200

Product # 701599

Hach Hardness (Calcium) Reagent Set, Buret, 2447000
Quick View
Hach Hardness (Calcium) Reagent Set, Buret, 2447000
$83.19

Mfr. Part # 2447000

Product # 701598

Hach Hardness 1 Buffer Solution, 50mL SCDB, 42426
Quick View
Hach Hardness 1 Buffer Solution, 50mL SCDB, 42426
$17.89

Mfr. Part # 42426

Product # 700638

Hach Hardness (Total) Reagent Set for 5-EP Test Kit, 2437900
Quick View
Hach Hardness (Total) Reagent Set for 5-EP Test Kit, 2437900
$43.85

Mfr. Part # 2437900

Product # 701580

Hach Hardness (Total) Reagent Set for HA-71A Test Kit, 2437800
Quick View
Hach Hardness (Total) Reagent Set for HA-71A Test Kit, 2437800
$66.09

Mfr. Part # 2437800

Product # 701579

Hach UniVer3 Hardness Reagent, 454 g with scoop, 2883702
Quick View
Hach UniVer3 Hardness Reagent 454 g with Scoop 2883702
$93.29

Mfr. Part # 2883702

Product # 701977