Hardness Blocker for Well & Borehole Water
(Hot Tubs & Swimming Pools)
Product Description
Mastersil Hardness Blocker is a highly effective liquid treatment designed specifically for hard water from wells or boreholes. It reduces limescale, calcium deposits, iron, manganese, and other minerals that cause cloudy, white, red, or brown water.
By binding these minerals into a stable complex, the product prevents scale build-up, protects pumps and heaters, and helps maintain clear, healthy water without staining or deposits.
Ideal for hot tubs and swimming pools filled with mineral-rich water.
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Benefits
•Reduces water hardness and limescale
•Binds iron and metal contaminants
•Prevents cloudy or discoloured water
•Protects pumps, heaters, and pipework
•Improves overall water clarity
•Essential for borehole / well water
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Dosage Guide (per 1000 litres of water)
•Slightly hard water (up to 20°N): 30 ml
•Medium hard water (up to 30°N): 60 ml
•Very hard water (over 30°N): 90 ml
👉 For most hot tubs, an initial dose of 50 ml per 1000 litres is usually sufficient.
👉 After the initial treatment, add one capful weekly as maintenance.
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How to Use (Step-by-Step)
1.Fill your hot tub or pool with water.
2.Add Hardness Blocker first — before any other chemicals.
3.Measure the correct dose based on your water hardness.
4.Mix the product in a plastic container with water.
5.Pour evenly into the hot tub or pool while filtration is running.
6.Run filtration for 24–48 hours (depending on hardness and metal levels).
7.After filtration:
•Clean or rinse the filter thoroughly
8.Once complete:
•Adjust pH levels
•Add your sanitizer (chlorine, bromine, or oxygen)
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What to Expect After Treatment
•Cloudy, white, red, or brown water should clear within 24 hours
•Minerals and metals will be bound and removed via filtration
•No scale deposits on surfaces or equipment
•Water becomes stable and easier to maintain
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Important Notes
•Always add Hardness Blocker BEFORE chlorine, bromine, pH+ or pH-
•Filtration must run continuously during treatment
•Repeat dosing when topping up water
•Suitable for hot tubs and swimming pools
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Product Size
1 Litre – Mastersil Hardness Blocker
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