In Parah 9:5, we read:

‮מֵי חַטָּאת שֶׁנִּפְסְלוּ, לֹא יְגַבְּלֵם בְּטִיט, שֶׁלֹּא יַעֲשֵׂם תַּקָּלָה לַאֲחֵרִים. רַבִּי יְהוּדָה אוֹמֵר, בָּטְלוּ. פָּרָה שֶׁשָּׁתָת מֵי חַטָּאת, בְּשָׂרָהּ טָמֵא מֵעֵת לְעֵת. רַבִּי יְהוּדָה אוֹמֵר, בָּטְלוּ בְמֵעֶיהָ:

Hatat water that became invalid, it may not be mixed into the mud since it might become a snare for others. Rabbi Judah says: it becomes neutralized. A cow that drank of the hatat water, its flesh becomes unclean for twenty-four hours. Rabbi Judah says: it becomes neutralized in its bowels.

Rambam comments that the halacha is not like R. Yehudah in either case. However, in his codification of this mishnah, he rules as R. Yehudah in the latter case (Hil. Parah Adumah 15:6–7):

הלכה ו: מי חטאת שנפסלו לא יגבלם בטיט שלא יעשם תקלה לאחרים שמא יגע בטיט ויטמא שמי חטאת אינם בטלין בטיט שנאמר חטאת היא:

Halacha 6: When sanctified water is disqualified, it should not be mixed with mud, so as not to create a stumbling block for others, lest they touch the mud and become impure. For the sanctified water does not become nullified in the mud, as implied by Numbers 19:9: "It is a sin-offering."

הלכה ז: פרה ששתת מי חטאת אף ע"פ שנשחטה בתוך כ"ד שעות בשרה טהור שנאמר למשמרת למי נדה בזמן שהן שמורין אינן בטלין אבל בזמן ששתאתן פרה בטלו שהרי אינם שמורין:

Halacha 7: When a cow drinks from sanctified water, its meat is pure even if it was slaughtered within 24 hours of drinking, as can be inferred from ibid.: "as safekeeping, as water for sprinkling." Implied is that when the water is kept safe, it is not nullified. If, however, a cow drank from it, it is nullified, because it was not kept safe.

The Kesef Mishnah suggests that Rambam ruled like R. Yehudah in this case due to a passage in the Sifre taking R. Yehudah's side.

However, I don't understand how it's possible to rule in the first case against R. Yehudah and in the second case with him. In particular, Rambam says (in halacha 7 above) that water that was "not kept safe" is indeed nullified. Water poured out into mud is "not kept safe", as far as I understand, yet he rules (in halacha 6 above) that the water is not nullified. How do we reconcile the two cases?

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