My experience tells me the water is a lot dirtier than imagined. My experience also tells me the cleanliness of the water cannot be gauged by looking at the ADS filter. It's great that it has a filter, better than units without one, but it is a sponge with relatively high porosity, which it has to have because the water is not pushed/pumped through it. The rollers will also pick up dirt - always good to compare a used roller with a new white one.
It's a nice unit, I've had one going on four years, and Werner Gläss continues to improve it, but the water gets dirty pretty quick. I think because it is hard to tell how dirty the water is (many factors are in play) that setting a number of records frequency for changing the water eliminates the guesswork.
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