Dramatic difference in testing results. Which one is right?

[SamAPFish]

So I just tested my water with an api phosphate fest and a salifert phosphate test and got dramatic differences. On the api I got 0.25 and the salifert I got at most 0.1 but more like 0.05 which one is right?

 

[Uncle99]

I don’t think the API reads less than .25......mine was .25 regardless of any mop up of organic through GFO, until I got a Hanna ch3cker which indicates .12

 

[SliceGolfer]

ICP>Hanna>Salifert>A Wet Thumb In The wind>API

 

[vetteguy53081]

API is less trusted and has been known to produce false readings

 

[SamAPFish]

ICP>Hanna>Salifert>A Wet Thumb In The wind>API

Best response so far

 

[SamAPFish]

I don’t think the API reads less than .25......mine was .25 regardless of any mop up of organic through GFO, until I got a Hanna ch3cker which indicates .12

Ok that sounds good

 

[X-37B]

Hanna ulr for phosphate and get the standard test vials.

 

[Scrubber_steve]

So I just tested my water with an api phosphate fest and a salifert phosphate test and got dramatic differences. On the api I got 0.25 and the salifert I got at most 0.1 but more like 0.05 which one is right?

Salifert.
I use to use Salifert, then switched to the new Red Sea Pro because it is much easier to read low range. But the Salifert was accurate

 

[SamAPFish]

Salifert.
I use to use Salifert, then switched to the new Red Sea Pro because it is much easier to read low range. But the Salifert was accurate

That’s good, I always thought I had really high phosphates so now I know