3. stone 's density difference

Because the stone  its ingredient content, the conditions how it formed are different, the different stone 's density has big difference. If the stone density and the porosity are different, then its water-absorptivity is different. the density high water-absorptivity is low, density low water-absorptivity is high.  A water-absorptivity higher stone  is easier to form the water stain.

4. the maintenance job not reasonable

Some stone  Manufacturer or the decoration company for some kind of purpose, clean the stone slab directly with the acid, the alkali, the residual acid react with some oxide compounds in the cement , and produce soluble salt, which then take up water and form the water stain (for example Shandong hemp stone  to have this kind of situation frequently), while the residual alkali may take up water directly and also produces the water stain.
Moreover, the some inferior protective agents also cause the stone  to produce the water stain pathological change.

5. environment reason

if the environment has the water source (or continue water source) or the stone  is often at the rain to drench, then the stone  relatively is easier to form the water stain.

When the stone  directly or indirectly contact with moist or is connected with the water source, for example the stone  installed in the bottom floor, but this area's subsoil water level excessively is also high, or stone  is nearby the damp pool, flow bed etc, may see the obvious water stain signatures frequently. This is mainly because the incessancy of the water source, it causes the stone  to be at the moist condition, and in the cement mortar, there are gelatin class  and the solubility salt alkaloid may unceasingly along with the water migration traversing stone , and forms the water stain in the stone  surface layer accumulation.  If the stone  is rained wet or is affected with damp, can aggravate the water stain seriously. Because the water volume are more, in the cement mortar the gelatin class  and the soluble salt alkaloid migration traversing stone  is easier, the stone  surface layer also gathers more.

In addition, sometimes due to environment pollution, part of stone color become darker, and make it look like the water stain.

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