I have had mine since 3/2007. I live in Houston so my water is pretty warm (92+) in the summer. What chlorine levels do you plan on running? I run about 3-4ppm with 50 ppm of stablizer. I have only shocked once and I used the super chlorinate feature from the IC20. How well the IC40 will work for you also depends on your runtime. I have a 2HP pump for 18,500 gallons (somehwhat overkill) but only run 6-8 hours a day (half at night to load the chlorine with none getting used from the sun). This gives me 2+ turnovers a day and can maintain my chlorine in the summer with the IC40 set to 40-50%.
Steve


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