Systems, apparatus, and methods for liquid treatment are provided including one or more of disinfection, filtration, and/or purification of the liquid using at least one electromagnetic field (EMF) including two or more specific and/or varying frequencies and pulses, the ENIFs optionally applied to the fluid using one or more of alternating current electricity, counter rotating magnetic fields, and/or oscillating electrical fields of alternating polarity, in order to provide treated liquids for different uses, such as, but not limited to water treatment for drinking or other purposes. Such systems, apparatus, and/or methods for treatment of a liquid optionally include providing systems, apparatus, and methods that are configured for treating water with one or more electromagnetic fields (EMFs) of two or more specific frequencies and pulses, to provide EMF treated liquid.