I am new to the pool world and have been learning a lot for my first year of installing our new 10,000 gal fiberglass pool. I am bound and determined to learn everything myself so I don't have to pay someone to take care of it. So far I'm comfortable, thanks to this website, in testing and correcting my pool's numbers to keep the water nice. I have actually made real nice cheat sheets & charts to help keep the chemicals in balance (if anyone is interested in them I can send), The only thing I cant grasp the concept of is the SWG level. I just need some guidance on what I could possibly be doing wrong if anything. I have a new Pentair Interchlor IC20 SWG (treats up to 20,000 gal pool) and for some reason I cant hold my chlorine levels where I want them. I keep ph levels good, CYA around 80, everything seems to be fine, but I think possibly Im not running my pump long enough??? Im running my 1hp Pentair pump for 5.5 hr (12pm - 530pm) the another couple hours from 8pm - 10pm. I have tried different percentages on the generator 50%, 60%, 70%, 80%, 90%, 100%. The only thing that seems to hold the levels is running the SWG at 100%. I can run SWG on super-chlorinate for 24hr and levels will come back in check, thats how I know its working. So saying all that to say this should I be running my pump more and the SWG at a lower percentage, or keep it the same time and the SWG running at 100%? I would just like to find a happy medium to keep from changing the SWG settings. Thank you all for all the knowledge on TFP.com!