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This item is NOT typically required just because a salt chlorinator is being installed.
Without proper bonding, low-level stray electrical current (galvanic current) can be generated in a pool because of the presence of multiple types of metal, even when the pool is not running. This current must be controlled to meet new building codes, provide a local ground, and to prevent possible galvanic corrosive damage to those metal pool components. If the pool does not have proper bonding, or if you have replaced your pool lights which were previous providing the bonding source, a sacrificial zinc anode is a simple solution to protect the entire pool.
This zinc anode provides an easier path for galvanic reaction to be attracted to, protecting expensive metal pool components. The zinc anode is simple to replace when the inexpensive zinc anode is roughly half-eroded; the sacrificial zinc anode lasts approximately 3 years in most cases. Its compact space-saving design is easy to plumb in.
Zinc Anode Instructions
What you need to know in 60 seconds!