Hello, I have a problem with the Grohe Rapid SL concealed system. We just bought it, it was mounted and when trying to drain the water instead of with a reasonable impetus, rinse the bowl, the water flies over the back wall of the bowl like a calm stream. It looks as if there was absolutely no pressure at the water inlet to the micha. Does anyone meet this and have an idea how to regulate it? Or maybe I just bought a greasy product
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