Hi Folks! I need to thank you for your advise from early November. We bought the "wet demo" J-345, and are loving it. I was in tonight, 4 degrees! The condition was truely flawless from what I could tell. Initial fill lasted until last week. It developed a ten minute head around the same time I sprung for a Taylor kit. CYA was extreme, and chlorine levels hard to raise. I've been lurking and gleaning here, and am going with an N2, MPS, enhanced shock strategy. My question here is if/when/how much on the stain & scale stuff? I've heard it doesn't play well with the N2.