It is recommended to wash the filters every 15 days (no more than 30 days in any case). It is also recommended to wash the filter if the dynamic pressure between the main pump (first left pressure gauge on the front panel) and the inlet pressure of the filter cartridges (central pressure gauge) is higher than 0,8 bar.
Follow the steps carefully and operate the washing procedure without workload.
Do not perform washing procedures on both filters at the same time: run the procedure on Quartzite sand filter first, then proceed with the Activated Carbon filter. Each cycle lasts 20 minutes.

1. Turn the knob of the head of the prefilter from “FILTER” to “BACK WASH” (red label) position and let the water flush to the drain for 15 minutes.

2. After 15 minutes turn the knob from “BACK WASH” to “FAST RINSE” (orange label) position and let the water flush to drain again for 5 minutes.

3. Turn the knob from “FAST RINSE” to “FILTER” position (green label) and start to work normally.

It is recommended to change the filter cartridges when the pressure difference from upstream (central pressure gauge) and  downstream (right pressure gauge) the filters  is greater than 0,8 bar
To change the filter cartridges, open the right panel of the chassis: the first housing on the left (A) contains the 20-micron filter cartridge. The second housing on the right (B) contains the 5-micron filter cartridge.

1. Set the system in bypass mode by setting the main valves as shown:

2. Near the filters, close the maintenance valve and open the depressurization valve as shown in the pictures:

3. Wait 20 seconds, then close the depressurization valve.

4. Unscrew the locking ring on the right side first. Use the provided plastic wrench, and release the cartridge housing as shown. Proceed then with the second housing.

5. Replace the filter cartridges and pay attention to properly center the guide on the housing head as shown.

6. Insert and screw by hand the locking ring. Then proceed to fasten it with the provided plastic wrench. Do not apply too much torque while fastening the ring.

7. Open the maintenance valve and set-back the main valves in operative mode as shown:

Check periodically the level of salt in the brine tank of the water softener.
Refill the salt if needed.