Abstract: A container of a water softening plant, comprises a first shell with a first chamber suitable for holding a brine solution and a second shell with a second chamber, separated from the first chamber, suitable for housing a tank, so keeping the tank separate from the mixture. The first shell and/or the second shell are manufactured by blow moulding.

Abstract: A tank for a water-treatment device, comprising an internal coating (2), a hollow insert (10), with a collar (14) projecting externally from the coating (2), and an external covering (40), which is created by wrapping a bundle of glass fibre buried in a polymeric matrix around the coating. The covering (40) comprises a portion of covering (50), which covers the collar (14), at least partially, reinforcing the connection between the insert (10) and the coating (2). The tank (1) is made by blowing or using a rotational press and subsequently wrapping the bundle of fibre buried in the matrix to make the covering (40) and the portion of covering (50).

Abstract: A container of a water softening plant, comprises a first shell with a first chamber suitable for holding a brine solution and a second shell with a second chamber, separated from the first chamber, suitable for housing a tank, so keeping the tank separate from the mixture. The first shell and/or the second shell are manufactured by blow moulding.