You'd be better off to run it at a higher ouput for either 8, 10 or 12 hours per day to save wear and tear and the life of the cell as long as it will maintain a good FC level.
 
The SWG doesn't care how long you run your pump, as long as it runs long enough for the SWG to produce enough chlorine, which is typically between 2 and 8 hours. More pump run time simply uses more electricity, but is fine with the SWG.

As woodyp said, you can almost certainly reduce your pump run time and save money and still be fine with the SWG.
 
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