If beer lines have been closed for a prolonged period, they will need a deep clean before re-connecting to fresh beer.
Likewise, if you suspect that your beer lines have a heavy build-up of yeast, old beer and biofilm, they will need more than an average cleaning procedure.
Poor line hygiene directly affects beer quality and yield, and can have a knock-on effect on customer satisfaction, and even staff retention in the long term.
Basically, if something exceptional has happened to create the problem, you need something exceptional to solve it too. Switching to this powder chemical designed for deep cleaning, encourages a different approach which is essential for achieving a good outcome.