4ppm? how many OZ is that?Minimum FC for your CYA is 5. Add 4ppm of liquid chlorine when you can. SWG is good at maintaining, but not raising. Keep your FC at 9 until you know your daily FC demand.
I would do this test tonight if you can or tomorrow...Link-->Overnight Chlorine Loss Test
Test with SWCG off. Test 30 minutes after SWCG off, pump running...and after sunset. In the morning, run pump 30 minutes and test before sunrise.
If you fail OCLT, we SLAM! Link-->SLAM Process
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