Alkalinity test using Hanna

[franklin]

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.

 

 

 

 

[dinGdinG]

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

[franklin]

Some sps bleaching on the base

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[sgtayc]

Tropic Marin pro is about 8dkh for salinity 1.025 . Considered quite low compare to other brand.

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[franklin]

Check the kh with salifert blue doesn't change color at all. this means my alkalinity is over 15 dkh. I turn of CR and will change about 20% today hope to get everything back slowly.