Hi Jalil For an open sea ...

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Hi Jalil

For an open sea water intake, definitely, no questions about it, you must use an out-in flow hollow fiber elements, do not even try the in-out elements, they will not work.

Even with the out-in flow you will need to increase the cleaning frequency when the red tide comes around, this is why you must have a good process design, gfd, pump capacity, enough and reliable instruments, a good pre-treatment, etc., and your OEM should be able to help you with that.

Just a piece of advice if you have the luxury of shutting down the unit during days the red tide is around, do it, you will significant increase the life of the membranes.

There are a couple of manufacturers that make good HFUF membranes, one of them is  Hydranautics or Toray or Dow, all three are good, I usually make my decision based on prices and delivery.

Good Luck and I hope this information helps you to make the right decision.

Luis Inarejo

Designh2o Inc

Canada