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Thanks for all the tips. Very valuable. It seems the tip about organics maybe the key. I did actually test chlorine about two weeks ago in the evening ( was 3ppm after dumping a gallon chlorine that day) and then next morning ( was down to 0.5 ppm). I even tested the IC20 on boost button for 24...

This is brand new unit only 3 weeks old and blades are shiny. I have tested my pool water with 3 indepent family owned pool companies. They all had the same results as stated above. There does not seem to be anything wrong with the water as far as they can tell. I assume they did much better job...

Sorry, it is NOT above ground. It is in ground...It is 14,000 gal. Water testing is done on weekly basis with a professional company. There is no algea in the pool and have professional maintenance each week... filters are all clean and main filter in Pentair unit is brand new ( replaced after...

Year old above ground pool, gunite, screened in FL. Water chemestry good.. PH 7.6, Salt 3600, CYA 80, Phosphates almost 0, Alkalinity 100, Calcium 70, Nitrate 0. But chlorine at 0 even at 100% output for 8 hours a day with IC 20. This is the 3rd unit from Pentair in a year!!! First one died...