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which method or test kit i should use to measure po4 for freshly mixed salt?

David Cher

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which method or test kit i should use to measure po4 for freshly mixed salt?

i used hi736 to measure the po4 fm salt and made sure that it is fully dissolve . it is reading at 25 ppb

did i do something wrong ?

the tds of the RODI is 0 and 0 on the hi736
 
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David Cher

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if the purpose of the water change is to lower po4 , you do not measure the incoming water, how to know whether does it work or not ?
 
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David Cher

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Po4 is phosphorus and shouldn't have this in the new saltwater mix this is why it lowers it when you switch out the water
here is the problem .

i measured my tank water before changing and after change , there is a 20ppb increase
what do you think ?
 

Pistol Peet

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here is the problem .

i measured my tank water before changing and after change , there is a 20ppb increase
what do you think ?
The only thing I could think of is there is maybe phosphorus in the kind of salt mix you use what brand is salt mix are you using do they use 100% pharmaceutical grade materials
 
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