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Alkalinity test using Hanna


franklin
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Need advice from Hanna users out there.

currently having trouble of alkalinity keep on dropping so I keep on adding baking soda to compensate the lost. 

last night I test my water not twice but three times using the currently reagent and open up a new reagent bottle. 

old reagent reading at 140ppm with bottle is almost going to finish, from new reagent bottle reading at 300ppm. I retest using new reagent and the same reading at 300ppm. I think I have to buy other brand to confirm which one is the correct reading.

I bought the same reagent from hanna Singapore, same batch.

did anybody experience this before?

how long should reagent last after opening?

If My tank if current alkalinity at 300. I need water change big time. or should I leave it for a while to deplete by it self.

thanks to all.

 

 

 

 

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  • SRC Supporter

Ive always been using salifert for dkh testing, works well and easy to use too.

Most cases, irregardless of what you keep, 300ppm = 16-17dkh, too high for any type of tank/reef imo.. any casualty so far?

WC will help but try to get a salt with lower dkh

Just have to keep reefing... cant stop now~!



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