sodium softened water

15:45 Mar 12 

es precisamente la presencia de sodio lo que puede suponer un problema con estas piedras artificiales, hasta donde entiendo:
... As displayed in Figure 6, ENS after 50 cycles (Figure 6d) underwent a greater change on the surface, evidenced by the more whitish and yellowish color. The accelerated degradation in the laboratory brings the brightness loss, yellowing, porosity, microcracks, and the mineral alteration state caused by the joint action of factors such as temperature and sodium presence (saline water). This leads to salt crystallization in the exposed pores, generating tensions responsible for increasing the diameter of pores and physical origin surface changes [38]. At 10 and 30 cycles, there was no significant surface change...
https://www.mdpi.com/2071-1050/14/12/7227