11 apparatus for the supply of water and for sanitary purposes, namely, industrial, commercial and residential water filtering units; apparatus and devices for preparing, purifying, cleaning, filtering, softening, decalcinating, desalting, dechlorinating, deacidifying and disinfecting water, namely, electronic water filtration device which prevents the accumulation of lime scale deposits and build ups in water lines and appliances; and parts for all of the aforesaid