Is there any relationship between alkali return of aerated brick and watermark?

No, the alkali return of aerated brick has certain reasons with cement quality, sand, water, air, temperature and humidity, and the material is also an important factor to determine the alkali return of wall, which has nothing to do with watermark. "Autoclaved aerated concrete block", referred to as aerated brick, is an aerated concrete block produced by high temperature autoclaving equipment technology.