BluWater 2lb Genesis Tru-Blu Sodium Bromide (TB100) aosmith A weir like this is

A weir like this is useful because it helps restore proper surface skimming action by regulating how water flows into the skimmer housing

Brand-specific switches like this are useful when preserving original equipment behavior and connection compatibility is important

You want the spa to react properly

and this Harwil version is a Q12DS kit with a 1/2 inch threaded connection

BluWater 2lb Genesis Tru-Blu Sodium Bromide (TB100) aosmith A weir like this isSodium bromide is an important support product in bromine based spa care, and this BluWater Genesis TruBlu Sodium Bromide is designed for compatible applications where the system requires the correct bromide source to support bromine generation. When the spa uses a bromine based sanitation setup, the right companion product helps the whole system feel more complete and more dependable. The 2 pound size gives this product practical value for homeowners