SWG cells simply are not designed to maintain such a high FC level. Cells are no match for organics. It over-works the cell and you get better dosing response/accuracy with liquid chlorine.
Like the above poster said it's really a waste of your cell life. Also, it will interfere with your FC readings. With the SWG running, you will not get a clear picture of how much FC the organic matter and UV is consuming in your pool during the SLAM. You should be running your pump 24/7 during the SLAM as well, so a proper OCLT is not possible.
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