Why the level of water in boiler gauge glass keep on increasing during normal operation ?

Why the level of water in boiler gauge glass keep on increasing during normal operation ?

As we knows the steam above the water level in gauge glass condenses to form water because the gauge glass is exposed to normal ambient temperature out-side the boiler. but you must have a doubt that the water level should be equalized as the same steam pressure is acting on both the water levels (ie, inside the boiler and in gauge glass). so the level must be equal .

Then how we are getting an increased level in gauge glass???

Its because of the difference in density. The water formed from condensed steam is very pure and density the boiler water is comparatively higher since it contains chemicals , suspended particles etc. so the lesser dense water will  show higher level.