Would it be possible to challenge the traditional counter-current water circulation system in a way that enables better soap washability, and thus improves process runnability in the kraft pulp fibreline? New water circulation alternatives were simulated in order to find ways to modify dissolved solids contents in the liquors and thus to improve soap washability. An application of using different fractions of liquors in dilution washing proved to be an interesting alternative. The presented modification principles should be applicable also in other branches of the chemical industry, especially when solubility is a limiting factor in washing.