alkatronic reagent

[Cassklar]

Hello
Could use a little help I just received a brand new 4l coral Vue concentrate and I mix 100ML of RODI to 250 ML of reagent. the problem I am having is the new reagent is reading 2 DKH higher than what my ALK is verified by salifert test kit which is new and also a ICP test. have some leftover reagent from my older bottle of 4L concentrate and it reads within .5 DKH of my salifert test and my ICP test does anyone know if the newer concentrate reagent is stronger somehow. any advice would be appreciated. I have also recalibrated probes replaced hoses and check for dosing pump accuracy an they are good

 

[Scubabum]

The correct mixing ratio is 4 parts rodi to 1 part concentrated reagent.

 

[Cassklar]

correct so wouldn't it be 1000mL to 250ML of concentrate that would make me 1250 ML of reagent correct?

 

[Scubabum]

correct so wouldn't it be 1000mL to 250ML of concentrate that would make me 1250 ML of reagent correct?

Yes that's correct. In your original post you said 100ml. I'm guessing that was a typo. Not sure what you have going on then, especially if you calibrated the pumps and probe.

 

[Cassklar]

sorry my mistake I just did a bunch of tests and I don't what is going on either here are my results

alkatronic normal test with my mixed reagent from my old bottle of 4L concentrate bottle is probably a year old stored in my cabinet
result 8.35
normal salifert test 8.45
salifet test with my mixed reagent from the older bottle test 8.9

new premixed coralvue reagent ready to use result 10.9
new bottle of concentrate I received a month ago mixed at a 80ml RODI to 20ML of concentrate test result 10.5

don't know what's going on