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Originally Posted by Proteus
Fozdown will floc alk out of water also so be ready to test and adjust as needed
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Since I produce and use Foz Down I thought I would reply as well.
Foz Down is based on a chloride salt. Even Calcium chloride will also cause alk to floc out of water if you add too much at once and the concentration is too high. Similar effect to Foz Down. This is why I recommend that the best way to use Foz Down is in an ATO freshwater reservoir. That way it gets diluted and dosed slowly and will not cause any alk issues. I have not noticed any alk issues with the multiple systems I use it on. These are dosed by using a pump channel on a GHL doser and spread throughout the day. Hope that info helps. I no longer use any GFO at all.
Cheers,
Tim