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PPM is a unit that describes the electrical conductance of the water and thus indirectly also the quality or degree of purity of the water, which is important for cleaning or osmosis purification.
The abbreviation comes from the English and means "Parts Per Million". This can be described as "foreign particles per 1,000,000 H20 particles". A value of 10 PPM therefore means that you could count 1,000,000 water molecules under a microscope and only encounter 10 other molecules. Accordingly, this is already a very high degree of purity. The unit also describes the electrical conductance, as the fewer minerals the water contains, the more difficult it is to conduct electricity through it.
Incidentally, a similar value is given as "micro-Siemens". For the cleaning industry, however, PPM measuring devices have become more common.
For cleaning work, we speak of pure water or ultrapure water if the PPM value of the water is below 30 or below 15. We should not exceed a conductance value of 30 PPM for cleaning solar systems. For windows or transparent surfaces, the value should not even be higher than 15 PPM, as otherwise small "spots or stains" could occur after drying.
