I think we all want to know the specific colour your water is. if this is suspended particles , just add a wad of filter wool to the first section of your filter ( it will clog quickly, but that is the point when it has removed all the suspended particles take it out and throw it away) poly filter wool is super cheap too. if it is an algae bloom, i.e. green algae cells floating about in the water, definitley reduce the time the light is on mate. 12 hours max! if you are out during the day ( and don't have live plants) put the light on a timer so it is only on in the evening when you are back. ( fish have no eyelids - they like the dark). if no joy, then these guys have already suggested the uv clarifier.
As an aside, i would test the water coming out of your tap, it might be really bad quality, if it is a chemical soup. you might need to use RO.
all the best mate,
Guy