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Location
Howell, NJ
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i think it has to do with the humidity near the sump. also what might work is if you do multiple small doses instead of one per day and keep it further away from the water line at least 5-6". i use the 3 magnetic probe holder and i can move it up and down with no problem.
 

TheSherm

Advanced Reefer
Location
Suffolk NY
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108   0   0
Ive had this too Kenny, I just try and check it when i do WC's and pinch it open if its is getting the buildup. Ive tried it further away from the water line, I even added a fan in the sump area to try and make it less humid.
 

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