While I was about to fix a slowly filling water tank I noticed some unusual black stuff.

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It kinda looks like wood ear mushroom. It is brittle when I touch it and easily separates. Is it just a swollen seal or is there something possibly growing in the toilet tank?

  • 1
    That is just rotted seals. Overhaul kit! ..... well, in this case, 'at least' a new filler kit. – noybman Jul 8 at 4:04

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