As Dave mentioned above, having enough CYA in the pool will help prevent the chlorine from being lost too quickly to sunlight. As far as when is ideal to run the SWCG, I'll let someone else who has one give you advice about that.
Are you aware that those Intex SWCGs have a copper electrode? You do not want copper in your pool. Contrary to popular belief, it is copper that stains things and turns blonde hair green, not chlorine. You can disconnect the copper electrode and use the SWCG without it.
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