We just received our Intex Krystal clear sand filter (2650 g/hr) and would like to switch out our existing 1000 g/hr cartridge filter. Can this be done with water in the pool? I see that the fittings are larger and I want to make sure that I am installing correctly. I have looked through previous posts and noticed some of you have switched out the standard filter for this model. Looking for advice, videos and of course wisdom! Thanks in advance!