Ken - many thanks! Domestic water has a high PH. We filter it for drinking with an apposite pitcher because it taste not so good, is full of limescale and many many debris. I used the water from the pitcher for the coffee machine and the cats' fountain too, otherwise pumps break after short usage.
But I cannot filter the huge quantity I need to water the garden. The filtered water has a PH of 6,5-7.
It's raining a lot, and it's slightly cold too, the plants are all producing new leaves but they were doing it before the rain too. I know they like rain water but this summer we had none so I had to use domestic water!