The water treatment apparatus includes a first and a second fitting adapted for being connected to a supply of fluid and to a container for the treated fluid, a longitudinally elongated rod having a first end mounting the first fitting and a second end mounting the second fitting and a first and a second vortexian spiral tube portion respectively having a first end fluidly connected to the first and second fitting. Each tube portions includes a plurality of loops and a plurality of somewhat linear sections serially connecting adjacent loops to one another. Where each tube portion includes seven loops, advantageously the area encompassed by the loops of each tube in the direction from one fitting to the other is 1:1:2:3:5:8:13:13:8:8:5:2:1:1 with the larger areas loops being fluidly connected to one another.