depending on how much water you want to produe would give a better idea of what unit to go for but a 300 gpd with a booster pump will produce plenty of water , it dont mater if its from ro man or pure freedom these style of units are all the same , 3x prefilters & 3x membranes . with you being from hull why not have a drive down to pure freedom at grimsby , theres some helpfull guys there who will sort you out with whats best for your needs .