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Dispose of the cleaning fluid in accordance with the disposal regulations. SETTING OF THE ALTO AUTOMATIC SCALE ALARM SYSTEM The automatic scale alarm system is set at the factory to water hardness class 2. Should an adjustment be necessary, proceed as follows: Measure the water hardness or ask your water supply company. Set the number of drops per minute (see table) at the metering device (Fig. 13). Hardness °dH Drops/min. class 1 soft 0-7 10 2 mediumhard 7-14 20 3 hard 14-21 30 4 very hard >