Problems testing Phosphate

[Urka]

For several months now I have been using two different test kits to test for phosphate in my tank. My Hanna Marine Mater keeps returning .9 so basically off the charts and my API kit keeps returning undetectable phosphates result. Can someone recommend another test kit? Thanks in advance!

 

[wvned]

Salifert

Hanna is generally pretty reliable.

 

[Urka]

Salifert

Hanna is generally pretty reliable.

Thanks, I will give it a try

 

[Reefing102]

I use salifert. And I also have a Hannah back up.

 

[hvcreefer]

I have had great luck with Hanna Checkers

 

[Vinny Kreyling]

Salifert READ & FOLLOW instructions!

 

[Timfish]

You can get PO4 standards on line to verify test kits. Here's a link to amazon for a .5 mg/l standard. it can be diluted to a lower number with distilled water

https://www.amazon.com/LabChem-LC185801-Phosphate-Standard-0-5mg/dp/B01BKWPL5K/ref=sr_1_3?crid=20LITPWAS4PA&dib=eyJ2IjoiMSJ9.xsX4ILmFzg3WhzoBW6KQstwFeMQERfwI8db09q00VIVFPq8m6fBCNGkqE21rx9N3-k3mB0PcGdR0XvlZvQhec1Z4tBoaFpFn4Y3-36VE8CYDKsXnd0LzYiqLbTpI-uT9Zumt1Rdu6T7QRt885NmMnC-lrlI_IBkzNAaAGVTU-BU.mw6-mjLdXm7G-qQc8m2OO5Wh0BkcZtBhTAuJIIazHkQ&dib_tag=se&keywords=po4+standard&qid=1724849209&sprefix=po4+standard%2Caps%2C225&sr=8-3