In the early 1960s, my parents installed a Permutit water softening unit in our family home. I have no idea why they did this. Maybe it was to save soap and the furring up of pipework. I am not sure that they would have done it had they known of the research that shows that heart disease is reduced as the hardness of drinking water increases.
The apparatus consisted of two cream coloured cylinders, each about five feet high, which stood next to each other in our garage by the side of the house. One of the cylinders was sealed shut and surmounted by a circular metal control wheel. Its neighbour could be opened by lifting a lid. Once a week, my father had to refresh the ion-exchange resin in the sealed container. This was done by adding salt in large quantities to the other cylinder, having removed its lid. By turning the control wheel at intervals dictated by an instruction manual, the refreshing cycle was completed over a period of about two hours. When the procedure was completed, my father used to test the softness of the water in our taps by mixing it with a soap solution supplied by Permutit. If a stable foam was produced, this indicated that the refreshment cycle had been completed successfully.
A special salt, called dendritic salt, was required for the weekly process described already. There was only one store that would both supply sacks of dendritic salt and, also, deliver it to our home. That store was the world-renowned Harrods in Knightsbridge, which brought us the salt in their silent electrically-powered delivery vehicles. In order to get these regular deliveries, my parents had to open a Harrod’s account.
Harrods has never been a store that one would enter hoping to find a bargain. In the sixties, they provided their customers with very attractive carrier bags. My late mother liked these, but she was not particularly interested in buying anything from the store in Knightsbridge. So, she used to enter Harrods and buy a packet of Polo mints, one of the least costly things on sale, and have the payment of them put on the family account. This low-cost purchase allowed her to get what she really wanted: a Harrods’ carrier bag.