the sea has SO MUCH water in it you have to have a VERY HIGH concentration of pollution... or be very close to a source of pollution before you will detect it.
an issue is, if the cloudyness is organic it will break down ....
my experience is that my tank does not seem to care if the water is clear or not. I suspect most of the cloudy is microsand bits as it settles in about an hour if stood still anyway.
I do however not collect with an onshore wind, tonight is a good wind, see you there about 9pm.....