Since getting a new kitchen tap that has a fine filter in the nozzle, we've been finding that it gets blocked up with whitish crumbly crud.
It's NOT limescale, we live in a soft water area. Vinegar has no effect. It's crumbly if you squash it and feels a bit gritty.
We have a mains pressure stainless steel HW tank.
What is this stuff? Could it be from a sacrificial anode in the tank?
Tim