Assertion: aquarium's water | /r/HasProperty | added after a water change
Facets:
value: to prevent ph shock
type: PURPOSE
Source sentences:
text: This said, test for pH is important before and after water changes, this includes the new water to be added after a water change so as to prevent pH shock by adding water to an aquarium that could change the aquarium pH more than .5 either direction on the logarithmic pH scale.