תלמוד על זבחים 158:6

“¹¹²Tosephta Ṭahorot 5:4 and Babli Zebaḥim 79b: The clay pot of the sufferer from gonorrhoea, the first and second rinses are impure but the third is pure. When has this been said? If he did put water in it, but if he did not put water in it, even the tenth is impure. Rebbi Eliezer ben Jacob said, even if no water was put in (but other, not impure people, used it), the third is pure.
It is clear that the Yerushalmi tradition cannot be reconciled with the Tosephta-Babli tradition. The concurrence of the mss. shows that the tradition is original. The Yerushalmi holds that water in a clay chamberpot becomes impure with the original impurity of the urine of a sufferer from gonorrhoea (Lev. 15); hence, presence or absence of remainders of the urine in the walls of the chamberpot becomes irrelevant. The clay pot of the sufferer from discharge, the first is impure but the second pure. When has this been said? If he did not put water in it, but if he put water in it even the tenth is impure.”