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 How to use third channel on dosing pump OK so I picked up three channel dosing pump I plan on dosing calcium and alkalinity but on the third channel I'm not sure if I should do vinegar or magnesium any input would be appreciated Sent from my iPhone using Tapatalk | 
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 I use it for Mag...but does very little | 
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 3-Part Balling System from Tropic Marin keeps my pump heads busy. | 
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 I'm already using Reefsupply two part plus their mag  Sent from my iPhone using Tapatalk | 
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 It will be better suited for vinegar, you can dose mag manually since you only really need to do it every few weeks. | 
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