Perfectly Clear is to relaunch this month ahead of the summer – the biggest time of the year for the soft drinks business.
The account is understood to be worth around £1m and the campaign to support the relaunch will run across outdoor, digital and press.
Silver Spring produces its range of drinks from its headquarters in Kent where a number of its products are exclusively distributed.
Silver Spring's range includes brands like Fizz Time, Fruit Squeeze and Little Smashers.
The7stars other clients include EMI, William Hill, and Ministry of Sound.