192. Immerse the paper completely in a glass of water for onesecond;3. Remove the paper from the water and shake lightly. Afterabout a minute, 1, 2, 3, or 4 red squares form, dependingon the hardness of the water. Each square corresponds toone level;14.2 Setting water hardness1. Press the P button (B4) to enter the menu;2. Turn the selection dial (B2) to select "Water Hardness".3. Confirm the selection by pressing the button (B9);4. Turn the selection dial and set the level shown by the indi-cator paper (C1) (see previous section);5. Press the button to confirm the setting;6. Press the button (B5) to exit the menu.The machine is now reprogrammed with the new water hard-ness setting.15. WATER SOFTENER FILTERCertain models are fitted with a water softener filter (C4). If thisis not the case with your model, you are recommended to pur-chase one from De’Longhi Customer Services.To use the filter correctly, follow the instructions below.15.1 Installing the filter1. Remove the filter (C4) from the packaging;2. Turn the date indicator disk (see fig. 38) until the next twomonths of use are displayed;3938Please noteThe filter lasts about two months if the appliance is used nor-mally. If the coffee machine is left unused with the filter in-stalled, it will last a maximum of three weeks.3. To activate the filter, run tap water through the hole in thefilter as shown in figure 39 until water comes out of theopenings at the side for more than a minute.;4. Extract the tank (A9) from the appliance and fill withwater;5. Insert the filter in the water tank and immerse it com-pletely for about ten seconds, sloping it to enable the airbubbles to escape (fig. 40);41406. Insert the filter in the filter housing and press as far as itwill go (fig. 41);427. Close the tank with thelid, then put the tankback in the machine (fig.42);When you install the filter,you must notify the applianceof its presence.8. Press the P button (B4) toenter the menu;9. Turn the selection dial(B2) (fig. 9) until "Installfilter" appears on the dis-play (B1);10. Press the button (B9);11. "Enable?" appears on the display;12. Press the button to confirm the selection. "HOTWATER Confirm?" is displayed;13. Position a container under the hot water spout (C6) (min.capacity: 16,9 fl.oz./500ml);14. Press the button to confirm the selection. The appli-ance begins hot water delivery and the message "Pleasewait" is displayed;soft waterhard watervery hard waterslightly hard water