Double glazing lasts for around 20 years but does change depending upon the excellent of your window models and the standard of the set up. Desiccant - this is where you have got bits inside the glass due to the seals failing. As with condensation, the one way to unravel https://lukasbypfs.thenerdsblog.com/34933767/helping-the-others-realize-the-advantages-of-double-glazing