YOU SAID:

there must be a filter out there for dirty water, or not

INTO JAPANESE

汚れた水のためにそこにフィルターがなければならない

BACK INTO ENGLISH

There must be a filter there because of dirty water

INTO JAPANESE

汚れた水のためにそこにフィルターがなければならない

BACK INTO ENGLISH

There must be a filter there because of dirty water