Siman 86
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א מַיִם סְרוּחִים אוֹ מֵי מִשְׁרָה, שֶׁשּׁוֹרִין בָּהֶן פִּשְׁתָּן אוֹ קָנַבּוֹס צָרִיךְ לְהַרְחִיק מֵהֶם כְּמוֹ מִן הַצּוֹאָה:
1 One Needs to Distance Oneself from Foul Water, containing 1 s'if Foul water or steeping water that is used for steeping flax or hemp - one needs to distance from them as from excrement.