c5 



E 



(U 



The test panels 

 were exposed in 

 sea during the 

 month of January. 



Membrane filter was 

 not ruptured after 

 70 and 112 days in 

 the sea. The filters 

 were found rup- 

 tured after 268 

 days in the sea. 



Microorganisms 

 were found inside 

 the 70- and 112-day 

 "control" cylinders. 



> 



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CO 

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 Q 

 5 



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 Q 



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 C7) 



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 <* 

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 (X) 



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Q 

 2 



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 < 



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 5 



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 2 



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 ■a 5 

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Panels placed 

 inside test 

 chambers sealed 

 with membrane 

 filter (control 

 panels) 



19 



