The Smoothed Particle Hydrodynamics is particle-based method, used for fluid dynamics problems. Among the strategies for implementing the SPH method, the ISPH (Incompressible SPH) has better accuracy and stability of results. The ISPH may be improved using artificial displacement techniques, removing the particles from their natural trajectories. However, this technique causes a unphysical behavior on the interface between the fluids. To prevent this, Cordeiro et al. (2013) introduces a interface treatment technique based on Level Set, which provides considerable results. However, the technique presents some volume variation during the simulations. Here is presented an improvement to the treatment interface technique by incorporating routines that prevent these volume variation.