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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 10 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 3.7 out of 5 by 14.
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
Rated 5 out of 5 by from Great Product, Great Price This is so easy to use, The people who are giving this bad reviews must lack common sense because all you have to did is fill a test tube to 10mm and add water and look at the colour. Really great price for the amount of tests you get, I prefer this to the tablet type kits.
Date published: 2019-04-19
Rated 1 out of 5 by from Did not work I live in an hard water area.Everything in the house suffers from scale build up. I followed the instructions on the test kit.I put blue drops into clear hard water and at no time did the water turn red.I e mailed Calmag and the reply was.If the sample stays blue then my water is soft.I have since found out from the water company that my water is hard- 18.55 degrees Clark (264 ppm) The kit didn’t work
Date published: 2019-04-08
Rated 2 out of 5 by from Colours difficult to make out. Even with only a 10ml water sample the coloured liquid becomes so dilute it's colour is difficult to make out. Doing the test on a white sheet of paper helps but the colour change is by no means clear-cut (I'm an ex Science teacher and used to colour changes). I was able to ascertain that my water softener was working but the test was by no means accurate.
Date published: 2019-04-06
Rated 4 out of 5 by from A good product Just followed the instructions
Date published: 2019-03-26
Rated 1 out of 5 by from Didn't work I bought this to check if my water softener was failing. I first checked it using water from the outside tap, as the non-softened water inside the house goes through a filter. I'm in the Thames Valley, where the water is known to be very hard around 300 ppm CaCO3. The liquid in the test tube started off blue, and stayed blue as I added more drops. I took it back to Toolstation who exchanged it for another - same result. I don't really understand it
Date published: 2019-03-11
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