Ozone or salt ??

The advantage goes to salt (or any other method of introducing chlorine) hands down

Ozone is usually a waste of money for an an outdoor residential pool. You have to have chlorine anyway (from a SWG or otherwise), and chlorine alone does a great job, so there isn't anything to be gained by adding an ozone system. Ozone is much more useful in a spa or in some situations where you have an extremely high number of people swimming every day (think commercial pool).

Any advantage to either?
 
There is no "Ozone or Salt". An SWG is a way to create chlorine in a pool rather than introducing it via outside sources. Ozone is a supplementary oxidation system that cannot be used on its own. Ozone is not of much use in an outdoor residential pool because the low bather load is easily handled by chlorine alone.

Skip the ozone, get the SWG if you want to avoid regularly dosing with liquid chlorine. Tim is absolutely correct, if someone is suggesting you can use ozone without also using chlorine they are steering you down a very costly and unsanitary road.
 
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