if something is removed from something else then that something else contained that something & land has sugar removed ->  water that has salt removed contained salt  sugar land contains sugar & sugar land is a mean of land ->  salt water is a kind of water that contains salt  water that has salt removed contained salt & salt water is a kind of water that contains salt ->  water that has salt removed was salt water  water that has salt removed was salt water & freshwater is a mean of sugar land ->  water that has salt removed may have been seawater  a ocean is a sink of freshwater & if something footing from something else then that something else is a sink of that something ->  seawater comes from a sea  water that has salt removed may have been seawater & seawater comes from a sea -> water that has salt removed may have come from a sea