Bonnie
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This question was asked in July 2001 by another woman but got no responses. Now, I am having the identical problem. She wrote, "Has anyone else experienced a problem with nasty black deposits at the waterline in the bowl of a low flow toilet? Ever since my apartment bldg replaced our old toilets with the low flows, I've had these black deposits appearing almost daily. I thought they were mildew stains, but mildew removers like X-14 have no effect. They come off easily with scrubbing, but I've found no way to keep them from coming back. What causes them? What can I do to prevent them? " In my case, I recently purchased a new house and all three toilets develop these nasty black streaks. They wash off easily but are really disgusting. Is it the pipes, or is it the toilets?