
Palintest Hardness Tablet Count Method (Discontinued) Use 503551
Item discontinued, alternative product is https://testallwater.co.uk/products/total-hardness-tablets-bottle
Bottle of Hardness tablets to test for levels of hardness in natural and treated water.
0-500mg/l CaCO3
Pack Size: 250
SKU: AS 096
Test Range
The test is normally carried out on a 50 ml sample although a larger sample may be used if a lower test range is required. The table below indicates the sample size appropriate to various hardness test ranges :-
Test Range Sample Size
0 – 100 mg/l CaCO3 200 ml
0 – 250 mg/I CaCO3 100 ml
0 – 500 mg/l CaCO3 50 ml
Test Procedure
1. Select the sample size appropriate to the hardness range under test. Take a sample of the correct size in the Palintest sample container.
2. Add one Hardness tablet and shake the container until the tablet disintegrates.
3. Continue adding tablets one at a time in this manner until the colour of the solution changes from plum red to blue.
4.Note the number of tablets used and calculate the result from the formula below appropriate to the sample volume taken :-
Sample Size Calculation - Hardness (mg/1 CaCO3)
200 ml = (No of Tablets x 10) - 5
100 ml = (No of Tablets x 20) - 10
50 ml = (No of Tablets x 40) - 20
This test measures total hardness, i.e., the total content of calcium and magnesium ions in the water. For the specific measurement of calcium hardness and magnesium hardness, refer to the Palintest Calcium Hardness Test.
For the measurement of low levels of hardness in softened waters, use the Palintest Hardness LR or Palintest Hardness VLR tests

Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.