DAF Systems and Dosing Rates

What is the ideal dosing for a seawater DAF system with a conventional pretreatment with DMF? The coagulant used is ferric chloride. Even though chlorination will prevent biogrowth at the intake, is it recommendable dosing chlorine while algae blooms happens? What about pH adjustment? Typically all of these questions are resolved trough jar tests, however, I would like to have some feedback from the network on this regard. Thanks