Two of these per day evaporate about 7 liters of water in total. Before that, I used ultrasonic, but because of the round-the-clock work, a white coating appeared on electronics and wires, despite the use of water from reverse osmosis. As a hygienic additive I use Maxi-Des concentrate, 8 drops at the first filling, and then for 2 weeks I just add water from osmosis. After two weeks, I pour out the water, wash the tank with maxi-disease and fill it again + 8 drops of the product. Slime does not form in the water, it only appears a little above the water level in the area of the level sensor.
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