Also - I wouldn't run the SWG on "boost" mode - it will cause the cell life to decrease faster than necessary. Just pick up a case of ultra 6% bleach. Test (diluting like posted earlier) and then add bleach (1 gallon 6% strength will raise chlorine 6ppm for every 10,000 gallons) to get the level to 15ppm-20ppm.
Since you have algae it will "eat up" the chlorine - so you need to test 3x a day and add chlorine (liquid bleach is best) until you get the level between 15-20ppm. Also brush daily and run filter 24/7.
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