Surely you water your plants regularly. You must be watering them all with tap water, right?
It is best to use rainwater
Indoor plants and balcony flowers as well as the plants in the conservatory must be watered regularly. summer and winter. For this we use the water from the tap. Where else would you get it from? Well, if you have a garden with a rain cistern, you can and should use the rainwater. This is best for the plants.
Tap water is usually very calcareous
If you cannot use the water from a rain cistern, you have to take the water from the tap. This in turn is calcareous and has a different pH value from area to area. However, lime is not suitable for many plants. These include ferns, orchids, azaleas, gardenias and the flamingo flower. These plants should not be watered directly from the tap.
Use distilled water or peat tablets
Basically it is recommended to buy distilled water. However, this is a very expensive affair. Alternatively, you can use a water filter if you have one. But you can also add peat tablets to the water. Incidentally, you can determine the degree of hardness of the water yourself with a test from a specialist retailer or ask the local waterworks.