iberean
New Member
There was an earlier 2004-05 thread about a black substance forming under the rim of a low flow toilet. Everyone said it had nothing to do with low flow toilets. Here's my issue which started only after a low flow toilet was installed. It began with spots of a black substance forming under the rim of the toilet then upwards and onto the bottom of the toilet seat. It is not fuzzy, it is not mold which I am highly sensitive to, some of it looks almost papery. This has been followed by a greyish/whitish rubbery like substance that forms and sits under the rim, it does not "crawl" anywhere. Both are easily removed with toilet brush and cloth but come back again. We have lived here almost 20 years and this only happened when we installed a low flush toilet, also there is no issue with the toilet tank, only where the water comes out under the rim. Initially I thought it was some substance inside that didn't get removed during manufacturing process but this has been ongoing for several years now. Does anyone have a clue? I am so fed up with this issue!