I've just bought an Intex 12 x 30 metal frame pool and want to get a pump/filter that will actually keep it clean. I'm getting confused reading a bunch of posts...Do I need a new pump and a new filter? Do they come together? I'm clueless! I've looked at both saltwater system and sand pump, but still don't know what I need. Do I need both? Can anyone make some specific suggestions for a newbie? Also, read that I'd need new fittings, is this correct? And do they come separate? Thanks