AUTOTROL head with mixer 255/440i 230V 50Hztime programmer mod.440 (weekly)cylinder of composite material 10x17incylinder capacity 17 Lconnection fitting 3/4"Fdimensions: width 325 mm depth 505 height without head 445 - overall height 645 resin content 10.5 L - salt container 40 Kg regeneration salt(NaCl-table salt)2 Kg We recommend to use always a mechanical filter before the softener in order to remove impurities from the water