Ordinary stagnant water is generally disqualified when impurity falls into it, and visible clarity alone does not resolve the issue.
Flowing water may be used if no relevant trace of impurity remains; an affected portion is not covered by that permission.
In an extensive pond, impurity at one edge does not necessarily determine the ruling of the far side, given the recognised separation.
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Impurity in Stagnant and Running Water, Large Ponds, and Aquatic Creatures
Ordinary stagnant water is generally disqualified when impurity falls into it, and visible clarity alone does not resolve the issue.
Flowing water may be used if no relevant trace of impurity remains; an affected portion is not covered by that permission.
In an extensive pond, impurity at one edge does not necessarily determine the ruling of the far side, given the recognised separation.