What characteristics are required for the SH?
First, it is important that the concentration is correct (usually 0.5 to 1.0 mg/l). A concentration that is too low requires too high a volume to adequately treat enough water to be practical. A concentration that is too high is difficult to accurately dose, raising the risk of too high a dose (which is unpalatable), or too low a dose (which might not effectively disinfect the water). Second, it is important that pH of the solution is at least 11. This increases the shelf life of the solution.
