Why has the concept of “softened wholesome water” been brought into the regulations and Approved Document?

The concept of “softened wholesome water” was introduced into Part G because in certain extremely hard water areas the water softening process can lead to sodium levels going beyond what is acceptable for wholesome water. This amendment makes clear that it is acceptable for such “softened wholesome water” to be supplied to washbasins, bidets, baths and showers.