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How do self-sealing water balloons work?

 title: 'Does Bunch O Balloons REALLY Work? - Mommy Mafia'

Self-sealing water balloons work by attaching a set of balloons to a garden hose, which provides the necessary water pressure to fill them[4][5]. As the balloons fill with water, they automatically drop off the hose attachment when they reach the appropriate size[5]. While some users have attempted to fill them using a kitchen sink, it is not recommended as a long-term solution because it requires holding the balloons very tightly to the faucet and lacks the consistent pressure provided by a hose[4].

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