Are you in a hard or soft water area? Soft water is water that is free from dissolved salts such as Calcium Carbonates and Sulphates. Naturally occurring Soft water is slightly acidic due to absorbed gases suc as CO2.
Soft water tends to be more pleasant for washing in, but can be aggressive to pipework. Lead in particular can be affected but causes very little damage to an underfloor heating ssystem.
Hard water is water which has fallen on or filtered through Calcium Carbonates or Sulphates (Chalk or Limestone). It dissolves small amounts of Calcium and carries it in suspension. This type of water does the most damage to an underfloor heating system.
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