Hello, first post :-D . I have been reading and learning. So glad to have found you all! Plans right now are for an inground vinyl, 18 x 36 grecian, sport, 3.5 each shallow ends, 5' 6" in the middle. Cantilever coping, liner over stairs on one end, bench with jets on the other end. Dig to start last week of June. PB says it will take one week. All the references say it will be more like 10 days. All references very happy with PB. This will be our second pool, first with SWG. Pool School is really great. I am a little confused. I am sure once it becomes hands on, it will make more sence to me..... But if I have a SWG, do I still use the BBB. On our last pool, we just took water samples to the pool store and added what they told us. I think with the help of this group, we should be able to handle it :-D