Choosing your Laundry System Model
O3 Pure Laundry Systems come in two different models:

     The LS High Flow Unit and LS Low Flow Unit - The high vs low flow refers to how much water your washer uses.

     Most North American top-load washing machines use a standard O3 Pure LS High Flow unit. However, front-load and some high efficiency top-load washing machines require the O3 Pure LS Low Flow unit.

     The Low Flow model will work with older top-load washers, but the average fill time will increase about 25%. Still if you plan on upgrading your washer in the future to a high efficiency model or front-load, the Low Flow may be a good choice as it can be used with either.