Answer:
The water is acidic.
Acidic water can be corrosive to the kiddie pool, ruining the material it is made of. Acid water can also irritate the skin and the eyes causing a burning sensation
Step-by-step explanation:
The pH scale ranges from 1-14 with 1 being extremely acidic, 14 being extremely basic and 7 being neutral. So 6.3 is acidic