Test kits Hannah or salifert for phosphate

[mrcool]

Whish is most accurate I have both on Hannah it shows high phosphate. On salifert nearly zero .
Opinions?

 

[griss]

Area reagents from either expired?

 

[mrcool]

No

 

[griss]

IME both are usually reliable and accurate. I’d lean towards testing with a 3rd kit to see which one is off. Could be bad reagents with either or an error made during testing.

 

[mrcool]

Yes I follow instructions to the T but I'll review procedure with Hannah .Salifert is to simple really to mess up. Thanks for reply

 

[griss]

I’ve had bubbles in the Hanna vial before that threw it off. I’ve also messed up Salifert by putting reagents in the wrong order by not paying close enough attention.

 

[mrcool]

Copy that, yeah I make sure no bubbles ,reagent is dissolved and clean vial with micro cloth before insertion into Hannah device. It just hard to know when reading Hannah says .9 and salifert shows
.1 and those numbers are repeatable. After adding some LC
To lower Po4 my Hannah did show a .14 once.