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Please excuse my ignorance, but this is my first post and I could do with a bit of help please, as im tying myself in knots trying to work out water additions for a biab kit i want to brew tomorrow.
Ive brewed several biab all grain kits in the past, but never amended my water before and ideally dont want to risk getting it wrong.
Ive tried using various calculators without success and asking ai chatbots for help (never again) they are scarily incorrect and totally contradict one another, which just added to my confusion.
So basically ive bought CRS and Calcium Chloride flakes, which i believe are the additions for this brew, but cant seem to work out how much i need of each.
My brew is
HBC Roggenbier Dunkel Original
Alcohol 5.2% makes 40 pints.
Grain:
3kg Rye Malt,
2.4kg Munich,
600g Caramunich,
60 Carafa
Hops: 10g Hercules, 20 First Gold
Yeast – Fermentis WB-06
I normally start with 40 litres of tap water and sparge the bag with an additional 6 litres and end up with 23 litres of beer after the boil
Ive mainly brewed stouts in the past which taste fine with my hard water and for lagers used Ashbeck, but tomorrow I want to amend and use my tap water.
Below is the information I think is needed for the calculation. Forgive me if ive included too much, but thought better that than not enough.
Anglian Water Profile for my area
Report period: January 2025 to September 2025
Hardness:
Your drinking water supply is classified as hard. The hardness has been shown in different units below to help you set your domestic appliances:
Total hardness as
Calcium (mg/l) Total hardness as
Calcium carbonate (mg/l) Total hardness as
Degrees Clark (°Clark or °e) Total hardness as
Degrees French (°f) Total hardness as
Degrees German (°dH) Total hardness as
millimoles (mmol/l of Ca)
68.62 171.55 11.94 17.155 9.744 1.716
(mg/l = milligrammes per litre is the same as parts per million)
Fluoride:
We don’t add fluoride to your drinking water supply, but there is naturally occurring fluoride present in all drinking water supplies.
Chlorine:
Disinfection is important to ensure there are no harmful organisms in the water. We use chlorine to disinfect drinking water supplies. In this Public Water Supply Zone we add a small amount of ammonia in this process which means your drinking water supply is chloraminated.
Lead:
If you live in a house built before 1970, you may have lead pipework. If you think you may have lead pipework, call our Lead Advice Line on 0345 070 3445 to arrange for a free lead test.
Work in your area:
To make sure the quality of the drinking water we supply remains excellent, we sometimes need to carry out work to ensure we continue to meet the legal limits specified in the Water Supply (Water Quality) Regulations 2016 (as amended). This work is known as a Programme of Work. Our Regulator, the Drinking Water Inspectorate, closely monitors the progress of this work and will formally sign it off when it is completed. The table below shows what we are doing in the Northampton North PWSZ:
(Where the Parameter says ‘Water in Buildings’, there are up to 20 parameters being monitored)
(Where the Parameter says 'PFAS', there are up to 48 parameters being monitored)
Parameter Programme of Work
Water in buildings Risk Assessments, Inspections, Customer Awareness
PFAS (per-and poly fluoroalkyl substances) Package of Measures
Lead Package of Measures
Drinking water sample results:
The results of tests carried out on drinking water samples taken from customer taps in this Public Water Supply Zone for the period are shown in the following table:
Parameter Legal Limit Units Number of samples taken
Sample Results
Minimum Average Maximum
Number of samples not meeting legal limit
MICROBIOLOGICAL PARAMETERS
Clostridium perfringens 0 No. per 100 ml 51 0 0 0 0
Coliform bacteria 0 No. per 100 ml 95 0 0 0 0
Colony counts (3 day at 22°C) No abnormal change No. per 1 ml 28 0 47 1301 0
E. coli 0 No. per 100 ml 95 0 0 0 0
Enterococci 0 No. per 100 ml 7 0 0 0 0
CHEMICAL PARAMETERS
1,2-dichloroethane 3 µg/l 51 <0.218 <0.218 <0.218 0
Aluminium 200 µg/l 28 <12 <12 <12 0
Ammonium 0.5 mg/l 28 <0.14 <0.171 0.224 0
Antimony 5 µg/l 7 0.1 0.15 0.25 0
Arsenic 10 µg/l 7 0.29 0.34 0.4 0
Benzene 1 µg/l 51 <0.125 <0.125 <0.125 0
Benzo(a)pyrene 0.01 µg/l 5 <0.002 <0.002 <0.002 0
Boron 1 mg/l 51 <0.043 <0.074 0.174 0
Bromate 10 µg/l 51 <0.7 <1.18 2.13 0
Cadmium 5 µg/l 7 <0.025 <0.025 <0.025 0
Calcium No legal Limit mg/l 2 59.478 65.576 71.673 0
Chloride 250 mg/l 51 16.1 47.2 76.5 0
Chlorine (free) No legal Limit mg/l 95 <0.05 <0.05 0.11 0
Chlorine (total) No legal Limit mg/l 95 0.12 0.68 1 0
Chromium 50 µg/l 7 <0.764 <0.764 <0.764 0
Colour 20 mg/l 28 <1.42 <1.57 2.1 0
Conductivity 2500 µS/cm @ 20 °C 297 278 475 575 0
Copper 2 mg/l 7 <0.038 <0.148 0.469 0
Cyanide 50 µg/l 51 <3.333 <3.333 <3.333 0
Fluoride 1.5 mg/l 7 0.271 0.307 0.332 0
Hardness (total) as calcium No legal Limit mg/l 1 68.62 68.62 68.62 0
Iron 200 µg/l 28 <21 <23 47 0
Lead 10 µg/l 7 <0.16 <0.862 4.643 0
Magnesium No legal Limit mg/l 2 5.593 6.84 8.087 0
Manganese 50 µg/l 28 <3 <3 <3 0
Mercury 1 µg/l 51 <0.069 <0.069 <0.069 0
Nickel 20 µg/l 7 <1.513 <1.633 1.96 0
Nitrate 50 mg/l 28 <7.526 <9.987 17.993 0
Nitrite 0.5 mg/l 28 <0.03 <0.042 0.251 0
Nitrite/Nitrate 1 28 0 0.151 0.359 0
Odour Acceptable to consumers and no abnormal change Dilution No. 28 0 0 0 0
PAHs (sum of 4) 0.1 µg/l 5 0 0 0 0
pH (Hydrogen ion) 6.5 - 9.5 pH value 28 7.09 7.34 7.85 0
Phosphorus No legal Limit mg/l 32 0.655 0.865 1.406 0
Selenium 10 µg/l 7 <0.722 <0.722 <0.722 0
Sodium 200 mg/l 7 <12.33 <17.476 30.831 0
Solvents (tetrachloroethane and trichloroethene) 10 µg/l 51 0 0 0 0
Sulphate 250 mg/l 51 48.74 97.16 115.42 0
Taste Acceptable to consumers and no abnormal change Dilution No. 28 0 0 0 0
Temperature No legal Limit °C 62 5.5 11.4 20.7 0
Tetrachloromethane 3 µg/l 50 <0.152 <0.152 <0.152 0
Total organic carbon (TOC) No abnormal change mg/l 51 2.72 3.34 4.76 0
Trihalomethanes (THMs) (total) 100 µg/l 7 12.9 13.9 15.6 0
Turbidity 4 NTU 28 <0.21 <0.21 0.24 0
PESTICIDES
Bentazone 0.1 µg/l 47 <0.008 <0.009 <0.016 0
Carbetamide 0.1 µg/l 5 <0.014 <0.014 <0.014 0
Clopyralid 0.1 µg/l 48 <0.018 <0.021 <0.036 0
Flufenacet 0.1 µg/l 40 0.01 0.011 0.028 0
Glyphosate 0.1 µg/l 51 <0.007 <0.007 0.012 0
Metaldehyde 0.1 µg/l 50 0.008 0.01 0.012 0
Metazachlor 0.1 µg/l 6 <0.03 <0.03 <0.03 0
Pesticides - Total 0.5 µg/l 52 0.006 0.026 0.071 0
Propyzamide 0.1 µg/l 47 0.004 0.014 0.043 0
Units
< Below the limit of detection of our analysis
mg/l Milligrammes per litre or parts per million
µg/l Microgrammes per litre or parts per billion
Pt/Co Platinum/Cobalt
µS/cm Micro Siemens per centimetre
Bq/l Becquerel per litre
mSv/year Micro Sieverts per year
NTU Nephelometric Turbidity Units
No legal limit There is no legal limit set in the Regulations
Kind regards,
Tim
Ive brewed several biab all grain kits in the past, but never amended my water before and ideally dont want to risk getting it wrong.
Ive tried using various calculators without success and asking ai chatbots for help (never again) they are scarily incorrect and totally contradict one another, which just added to my confusion.
So basically ive bought CRS and Calcium Chloride flakes, which i believe are the additions for this brew, but cant seem to work out how much i need of each.
My brew is
HBC Roggenbier Dunkel Original
Alcohol 5.2% makes 40 pints.
Grain:
3kg Rye Malt,
2.4kg Munich,
600g Caramunich,
60 Carafa
Hops: 10g Hercules, 20 First Gold
Yeast – Fermentis WB-06
I normally start with 40 litres of tap water and sparge the bag with an additional 6 litres and end up with 23 litres of beer after the boil
Ive mainly brewed stouts in the past which taste fine with my hard water and for lagers used Ashbeck, but tomorrow I want to amend and use my tap water.
Below is the information I think is needed for the calculation. Forgive me if ive included too much, but thought better that than not enough.
Anglian Water Profile for my area
Report period: January 2025 to September 2025
Hardness:
Your drinking water supply is classified as hard. The hardness has been shown in different units below to help you set your domestic appliances:
Total hardness as
Calcium (mg/l) Total hardness as
Calcium carbonate (mg/l) Total hardness as
Degrees Clark (°Clark or °e) Total hardness as
Degrees French (°f) Total hardness as
Degrees German (°dH) Total hardness as
millimoles (mmol/l of Ca)
68.62 171.55 11.94 17.155 9.744 1.716
(mg/l = milligrammes per litre is the same as parts per million)
Fluoride:
We don’t add fluoride to your drinking water supply, but there is naturally occurring fluoride present in all drinking water supplies.
Chlorine:
Disinfection is important to ensure there are no harmful organisms in the water. We use chlorine to disinfect drinking water supplies. In this Public Water Supply Zone we add a small amount of ammonia in this process which means your drinking water supply is chloraminated.
Lead:
If you live in a house built before 1970, you may have lead pipework. If you think you may have lead pipework, call our Lead Advice Line on 0345 070 3445 to arrange for a free lead test.
Work in your area:
To make sure the quality of the drinking water we supply remains excellent, we sometimes need to carry out work to ensure we continue to meet the legal limits specified in the Water Supply (Water Quality) Regulations 2016 (as amended). This work is known as a Programme of Work. Our Regulator, the Drinking Water Inspectorate, closely monitors the progress of this work and will formally sign it off when it is completed. The table below shows what we are doing in the Northampton North PWSZ:
(Where the Parameter says ‘Water in Buildings’, there are up to 20 parameters being monitored)
(Where the Parameter says 'PFAS', there are up to 48 parameters being monitored)
Parameter Programme of Work
Water in buildings Risk Assessments, Inspections, Customer Awareness
PFAS (per-and poly fluoroalkyl substances) Package of Measures
Lead Package of Measures
Drinking water sample results:
The results of tests carried out on drinking water samples taken from customer taps in this Public Water Supply Zone for the period are shown in the following table:
Parameter Legal Limit Units Number of samples taken
Sample Results
Minimum Average Maximum
Number of samples not meeting legal limit
MICROBIOLOGICAL PARAMETERS
Clostridium perfringens 0 No. per 100 ml 51 0 0 0 0
Coliform bacteria 0 No. per 100 ml 95 0 0 0 0
Colony counts (3 day at 22°C) No abnormal change No. per 1 ml 28 0 47 1301 0
E. coli 0 No. per 100 ml 95 0 0 0 0
Enterococci 0 No. per 100 ml 7 0 0 0 0
CHEMICAL PARAMETERS
1,2-dichloroethane 3 µg/l 51 <0.218 <0.218 <0.218 0
Aluminium 200 µg/l 28 <12 <12 <12 0
Ammonium 0.5 mg/l 28 <0.14 <0.171 0.224 0
Antimony 5 µg/l 7 0.1 0.15 0.25 0
Arsenic 10 µg/l 7 0.29 0.34 0.4 0
Benzene 1 µg/l 51 <0.125 <0.125 <0.125 0
Benzo(a)pyrene 0.01 µg/l 5 <0.002 <0.002 <0.002 0
Boron 1 mg/l 51 <0.043 <0.074 0.174 0
Bromate 10 µg/l 51 <0.7 <1.18 2.13 0
Cadmium 5 µg/l 7 <0.025 <0.025 <0.025 0
Calcium No legal Limit mg/l 2 59.478 65.576 71.673 0
Chloride 250 mg/l 51 16.1 47.2 76.5 0
Chlorine (free) No legal Limit mg/l 95 <0.05 <0.05 0.11 0
Chlorine (total) No legal Limit mg/l 95 0.12 0.68 1 0
Chromium 50 µg/l 7 <0.764 <0.764 <0.764 0
Colour 20 mg/l 28 <1.42 <1.57 2.1 0
Conductivity 2500 µS/cm @ 20 °C 297 278 475 575 0
Copper 2 mg/l 7 <0.038 <0.148 0.469 0
Cyanide 50 µg/l 51 <3.333 <3.333 <3.333 0
Fluoride 1.5 mg/l 7 0.271 0.307 0.332 0
Hardness (total) as calcium No legal Limit mg/l 1 68.62 68.62 68.62 0
Iron 200 µg/l 28 <21 <23 47 0
Lead 10 µg/l 7 <0.16 <0.862 4.643 0
Magnesium No legal Limit mg/l 2 5.593 6.84 8.087 0
Manganese 50 µg/l 28 <3 <3 <3 0
Mercury 1 µg/l 51 <0.069 <0.069 <0.069 0
Nickel 20 µg/l 7 <1.513 <1.633 1.96 0
Nitrate 50 mg/l 28 <7.526 <9.987 17.993 0
Nitrite 0.5 mg/l 28 <0.03 <0.042 0.251 0
Nitrite/Nitrate 1 28 0 0.151 0.359 0
Odour Acceptable to consumers and no abnormal change Dilution No. 28 0 0 0 0
PAHs (sum of 4) 0.1 µg/l 5 0 0 0 0
pH (Hydrogen ion) 6.5 - 9.5 pH value 28 7.09 7.34 7.85 0
Phosphorus No legal Limit mg/l 32 0.655 0.865 1.406 0
Selenium 10 µg/l 7 <0.722 <0.722 <0.722 0
Sodium 200 mg/l 7 <12.33 <17.476 30.831 0
Solvents (tetrachloroethane and trichloroethene) 10 µg/l 51 0 0 0 0
Sulphate 250 mg/l 51 48.74 97.16 115.42 0
Taste Acceptable to consumers and no abnormal change Dilution No. 28 0 0 0 0
Temperature No legal Limit °C 62 5.5 11.4 20.7 0
Tetrachloromethane 3 µg/l 50 <0.152 <0.152 <0.152 0
Total organic carbon (TOC) No abnormal change mg/l 51 2.72 3.34 4.76 0
Trihalomethanes (THMs) (total) 100 µg/l 7 12.9 13.9 15.6 0
Turbidity 4 NTU 28 <0.21 <0.21 0.24 0
PESTICIDES
Bentazone 0.1 µg/l 47 <0.008 <0.009 <0.016 0
Carbetamide 0.1 µg/l 5 <0.014 <0.014 <0.014 0
Clopyralid 0.1 µg/l 48 <0.018 <0.021 <0.036 0
Flufenacet 0.1 µg/l 40 0.01 0.011 0.028 0
Glyphosate 0.1 µg/l 51 <0.007 <0.007 0.012 0
Metaldehyde 0.1 µg/l 50 0.008 0.01 0.012 0
Metazachlor 0.1 µg/l 6 <0.03 <0.03 <0.03 0
Pesticides - Total 0.5 µg/l 52 0.006 0.026 0.071 0
Propyzamide 0.1 µg/l 47 0.004 0.014 0.043 0
Units
< Below the limit of detection of our analysis
mg/l Milligrammes per litre or parts per million
µg/l Microgrammes per litre or parts per billion
Pt/Co Platinum/Cobalt
µS/cm Micro Siemens per centimetre
Bq/l Becquerel per litre
mSv/year Micro Sieverts per year
NTU Nephelometric Turbidity Units
No legal limit There is no legal limit set in the Regulations
Kind regards,
Tim
