Add the boiled to make a solution not to fall to extremists in between shifts and make film evaporation on the surface of some reduction in aqueous solution. Evaporation occurs.
The increasing agitation will pamper your solution does not fall just before the film on the surface of the solution evaporates and make some cuts. The more volatile
Increasing the stirring blade makes the solution not the fall with the gun during the evaporation on the surface and make film concentrated ลายบ work to reduce the evaporation easier.