We just filled a new 15 x 48 easy set pool in preparation for grandkids. I'm reading pool school and learned that either liquid chlorine (which I've done for now) or SW chlorine generation is best. I'm lazy, so the salt water system sounds good to me, but I'm still not literate in all this. I see that I need a separate filter and pump as well as the SWG system. Is the Intex Krystal Clear 637R adequate, or will I need/want to get a higher flow DE system? Can I start out with the 637R by itself and add the SWG later (using liquid chlorine meantime) and also later swap out the filter/pump for something better? I hope fittings and such aren't so specific that I have to map out everything way ahead. Also, I found the Intex CG-28669 Krystal Clear SWG on Amazon for about $150. Is that a good choice, or should I go with another dedicated SWG company and product. Appreciate advice and support from everyone on this forum.