ARO membrane pumps, at the same conditions, consume 56 Nmc/ h less than the previously installed WILDEN and SAND PIPER membrane pumps: calculating an average of 15 hours a day, this results in a savings of 56 x 15 = 840 Nmc per day. The average annual savings of each ARO membrane pump amounts basically to 5.250 euros, and taking into account that Ricchetti Group owns twenty, the overall savings in more than 105.000 Euros!