Hello everyone, new to the forum. I've been noticing very low to no chlorine levels in my pool for a couple of weeks. Taken water samples to a couple of pool stores, CYA levels at 60 at one store, next day took to another it was at 0. Don't worry, ordered the TFT100 yesterday and will check it myself from now on. After reading through this forum I understand I must SLAM since chlorine is almost none excitant even though there's no visible algae but water gets cloudy after heavy swimming. My pool builder set up my SWG to 50% running the pump at 24 hours, 21 on low and 3 on high to run my sweeper. After SLAM is complete, how do I keep my SWG running high enough not to have this problem again? I would have figured with it running for 12 hours a day I would not have this problem. Also, direct sunlight on pool for about 80% of the day, water temperature is at 89 without the heater. Thanks in advance for the advise.