Talmud for Zevachim 158:1
תנו רבנן חרסן של זב וזבה פעם ראשון ושני טמא שלישי טהור
<br> Our Rabbis taught: As to the shard of a zab and a zabah, the first and second time it is unclean, the third time it is clean. When is that? if one poured water into it; but if one did not pour water into it, it is unclean even the tenth time. R. Eliezer b. Jacob said: At the third time it is clean even if one did not pour water into it. Now, whom do you know to maintain that one kind is not nullified by its own kind? R. Judah. But the following contradicts it: If flax was spun by a niddah, he who moves it is clean; but if it is damp, he who moves it is unclean, on account of the fluid of her mouth. R. Judah said: One also who moistens it in water is unclean, on account of the fluid of her mouth, even [if he washes it] many times! - Said R. Papa: Saliva is different, because it is incrusted. <br>
Jerusalem Talmud Terumot
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.”