tim01

Hi Folks, I have a perplexing problem with my new pool. The pool was completed a year ago with a pentair easytouch 2 body water computer and an IC 40 intellichlor chlorine generator installed. The pool capacity is 10,000 gallons and has a pebble tech finish and no spa. The IC 40 is oversized for the pool. I purchased the easytouch and intellichlor via the internet not being aware that it was possible to purchase a single body computer. I purposely over-sized the intellichlor unit. When I first started the pool, under recommendation from the intellichlor manual, I did not connect the intellichlor to the easytouch computer, but did plumb it into the system. During the entire winter I did not connect the unit to the easytouch and used chlorine tabs. Last April I added the recommended amount of salt, connected the intellichlor unit to the easytouch computer and I have had trouble ever since. The problem was the intellichlor unit did not seem to consistently produce chlorine and when it did it was either way to much or not enough. I tried many times adjusting the percentage on time and nothing seemed to work. I contacted pentair tech support and they kept telling me my pool chemistry must be off even though I took samples into pinch a penny and they verified that all was well. This was on-going for about 4 months. Finally in frustration, I contacted a local service tech about a month ago, he came out and replace a computer board in the easythouch unit. I thought all was well until 2 weeks ago we had algae in the pool. The percentage on time has been at 90% for the last 2 weeks. Yesterday morning I checked and had 0 chlorine in the pool. I left the percentage on time for the chlorinator to 90%. Now remember this is an IC 40 unit and a 10,000 gallon pool. The pump was on for 6 hours. I live in the Tampa bay area, FL. I checked the chlorine level right when the pool pump turned off and I got a reading of over 3ppm chlorine as would be expected. I got up this morning before the pump came on and the chlorine reading is 0. Pool chemistry was checked yesterday and the only thing off was the alkalinity was a little low at 60. Stabilizer level is at 60. Phosphates are 0. What could have possibly eaten up all the chlorine over night? I travel frequently so it's been difficult for me to determine if there is a trend to the chlorinator, but I've got my wife on board and she or I will check the chlorine level every morning and every evening to see if the chlorinator is consistently producing chlorine. But I still can't figure out what happened to the chlorine last night. Any suggestions. Tim