Cut to the chase and just read the bottom paragraph or read all of this for details:
Here are my current water specs:
FC: 8.0 (This is my minimum/target level. I usually take it up to 11 each night and lose 3.0 FC over the next 24/hrs. leaving me back at my target level.)
As stated in my signature, the pool is a Intex 18' x 48" round inflatable ring AG pool. See all the other pool info there too please. I just replaced the SWG a few days ago. The specs indicate the SWG can produce a max of 12 grams/hr. of chlorine output. The manual for it also indicates that I'm supposed to run it for 3 hours a day which I always have. The filter pump turns on. Then, the SWG turns on and runs for 3 hrs. and then it turns off and the filter pump turns off shortly after. I set it to boost today at about 10:00 AM. The FC was at 7.5 at that time. I checked the FC about 1 hour ago ( 7:00 PM), after had been running for about 9 hours. The FC was now at 10.0 FC. During this time the pool had 3 bathers and got rained on a few times by a sky that was overcast all day long. On a regular long, sunny and fun day in the pool, it seems to eat about 3.0 FC a day. How long to I have to run the little SWG at night at 12 grams per hour at best to produce 3.0 of FC?
I started at 7.5 FC this morning and I figure I lost 2.0 FC while my wife and kids played in the pool for much of this totally cloudy day. My math says that takes it from 7.5 FC down to 5.5 FC. Then my little SWG generated 4.5 over 9 hours to get it back up to 10.0 which is a net of 4.5 FC over a 9 hour period. That would indicate it makes 1.5 FC each 3/hrs. during the active swimmers and rainy day. Thus 3.0 FC would take 6 hours and not just 3 hrs. as the book indicates that I need for this little 5,455 gallon pool. Is that because it is summer and the book doesn't take temps into account? Temps don't matter anyways though right when it comes to how much the SWG generates? This model can only generate more by way of running longer. I'd rather not run my pump and filter 6 hours a day to get 3.0 FC added to my total FC. I thought I did everything I needed with CYA and borates and great water management to keep my pump and SWG times to a minimum. Am I missing something or does the new SWG just not work efficiently?
What is the formula? How long should it take a SWG producing 12 grams of chlorine an hour to raise the FC exactly 3.0 FC? That is what I'm wanting this one to do each night starting at about 8:00 PM.