Just a tile cleaning fool these past two days. Working in Whistler on a clients home making things look pretty. This Kerdi Drain was never cleaned I bet from day one.
Original setter left grout in between the strainer and the base and there is some kind of crust growing inside the Kerdi Drain on the ABS. Yuck.
We used a heavy duty tile and grout cleaner to Spruce up the condo. Look closely at the drain where it meets the grout. The effloresence is everywhere in this Kerdi shower but worst at the curb, niche and drain.
This shower is only two years old. I believe there to many boding issues in this condo as well with the other tile and other shower. I'm guessing about 20% of the tile is not properly bonded. It sounds hollow when tapped everywhere.