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Free Saturday Delivery on orders over £75

Product Details

• 15 droplet tests in one kit
• Colour changes to reflect exact water hardness level
• Gives recommendations of required water treatment
Helpline No. 01535 210320.

Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 8pm Mon-Sat (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Water Hardness Test Kit is rated 3.1 out of 5 by 20.
Rated 1 out of 5 by from Mostly does not seem to work. Odd With a non softened supply (around 350ppm according to water co) all i get is blue. Never red(ish). If i try it with my softened supply i do get a red/purple tinged start which moves to pure blue. It seems like it cannot deal with water that is too hard. Which seems rather odd. But this makes it very hard to trust that it is working at all.
Date published: 2019-11-09
Rated 1 out of 5 by from A waste of money The kit doesn't work. Colourless end point for both hard and for softened water. I couldn't see any colour at all in any of the water I tested. I emailed Calmag but they didn't really help with this. I would not recommend this kit in any circumstance.
Date published: 2019-10-03
Rated 1 out of 5 by from Ambiguous, difficult to read result. The colour changes are so slight it is difficult to get a meaningful result. Go for Simplex Health test strips, whose results are clear, changing from lemon yellow in soft water to deep red in 300ppm hard water, through various shades of orange. (NB I have no connection with Simplex, just experience of both methods.)
Date published: 2019-08-30
Rated 2 out of 5 by from Results are anything but clear. On first try to solution showed no sign of the red colour, though our water is 300ppm hardness according to the water company. I shook the reagent bottle for a few minutes (no mention of this on the instructions), and a test now produced a very pale pink. More drops resulted in a gradual shift through purple to blue, so no sharp indication.
Date published: 2019-08-12
Rated 1 out of 5 by from Calmag Water Hardness Test Kit dont buy this on the bottle BLUE clearly says HARD and apprantely blue is soft water, it is not worth buying a product where people can't the basics right!! aweful....dont waste your money, I got a full REFUND, pointless.
Date published: 2019-07-16
Rated 5 out of 5 by from Works a treat! This works well! The instructions could be clearer though, in terms of what to expect. If your water is soft, the solution will turn a clear blue sooner. If it's hard, it turns a clear reddy/pinky colour and as you add more drops, it turns to a clear blue solution. The more drops I added, the more opaque the solution becomes. Softness/hardness is not a point change, it's a gradual change, so the colour change is likewise, a gradual process. Very pleased with the test kit, very simple to use! Highly recommended.
Date published: 2019-05-17
Rated 5 out of 5 by from Does the job I use this kit every 6 months to check my softener is working correctly. Easy to follow instructions and helps reduce scale build up if used correctly with a softener & descaler.
Date published: 2019-05-12
Rated 5 out of 5 by from Water hardness tester Easy to use, very accurate. Helped me to set the appropriate hard water level on the dishwasher.
Date published: 2019-04-25
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