have you tested it? i had water that sounds like your describing and my ammonia was off the chart?
is it a new filter? or maybe the filter is not big enough for the tank/fish you have in there, if it a new setup then chances are it s bacterial bloom which dosent get any better with water changes, infact in my experience it gets worse,but will clear up on its own in a few days, but keep testing it.have you put carbon in the filter yet, this may work along with some filter floss
have you done a gravel vac?
shelagh xxxx