Related for Berakhot 49:25
לימא כתנאי כלי שנשפכו ממנו מי רגלים אסור לקרות ק"ש כנגדו ומי רגלים עצמן שנשפכו נבלעו מותר לא נבלעו אסור ר' יוסי אומר כל זמן שמטפיחין
is like [the following discussion of] the Tannaim : It is forbidden to read the Shema' by a vessel from which urine has been poured; but with urine which has been poured out, if it has been absorbed it is permitted, if it has not been absorbed it is forbidden. R. Jose says : So long as the earth is sufficiently wet to moisten [it is forbidden].
Tosefta Berakhot
[A person] should not spill water [with feces in it] in a place where he [wants to] pray [Shemoneh Esreh], but rather he should [spill it] four Amot away [from that place]. If [the feces have] dried up or reabsorbed (i.e. dissolved) then it is permitted [to pray Shmoneh Esreh next to them].
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