Quoting%20commentary for Parah 5:3

קֵרוּיָה שֶׁהִטְבִּילוּהָ בְמַיִם שֶׁאֵין רְאוּיִין לְקַדֵּשׁ, מְקַדְּשִׁין בָּהּ עַד שֶׁתִּטְמָא. נִטְמְאָה, אֵין מְקַדְּשִׁין בָּהּ. רַבִּי יְהוֹשֻׁעַ אוֹמֵר, אִם מְקַדֵּשׁ הוּא בָהּ בַּתְּחִלָּה, אַף בַּסּוֹף יְקַדֵּשׁ בָּהּ. אִם אֵינוֹ מְקַדֵּשׁ בָּהּ בַּסּוֹף, אַף לֹא בַתְּחִלָּה. בֵּין כָּךְ וּבֵין כָּךְ, לֹא יוֹסִיף לְתוֹכָהּ מַיִם מְקֻדָּשִׁים:

A [dried and hollowed] gourd that was immersed in water that is unsuitable for sanctification, we sanctify [water for the ritual] in it as long as it has not yet become impure. Once it becomes impure, we do not sanctify in it [because we are concerned that it will emit invalid water into the sanctified water]. Rabbi Yehoshua says: If you allow it to be used for sanctification from the start [before it became impure], so too at the end [after it became impure] may you sanctify in it. If you do not allow sanctifying in it at the end, so too not at the beginning. Either way, one should not add into it [already] sanctified water.

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