what size SWG for a 25,000 gal pool?

The general rule is to order a cell that is rated at twice your pool size. However, like me you are between sizes. I have a 22k Gallon pool and have the T-15. It has been able to adequately chlorinate our pool at 50% running 10 hours a day. I am a lot farther north than you, so I would wait to hear from someone closer to your location with a similar size pool (and I'm sure they will be here shortly!).
 
Right now I am running my IC40 at 60% about 8 hours per day, 20k gallons. We swim every day and a lot on the weekend. Year 3, season 4. I am very happy with it.
 
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