I'm running my '09 Intex in the evening, after the sun has passed off the water. I turned it back to 3 hours today, my chlorine is off the chart. Pool looks good, though. I'm using strips for cya, salt & borates. Salt is dead on, cya says low, borates read almost nonexistent...yet I know how many boxes I've put in, both cya and borax. Hey, water looks great, feels great (tad cool this week after three weeks around 99) so, since it ain't broke, ain't gonna try to fix it.