Both treatments accomplish the goal of destroying and removing bather waste and preventing the formation of combined chlorine.
Super chlorination, the addition of large amounts of chlorine, has some drawbacks. Because it requires large amounts of chlorine, it can damage liners and swimsuits and upset water balance. Additionally, it is difficult to determine proper dosage amounts and it requires swimmers to wait until the level of chlorine drops, often a day or more, until they can swim.
Non-chlorine shock, on the other hand, does not require excessive chlorine use and allows swimming almost immediately after application, does not harm liners, has easily determined dosage rates and does not upset water balance.