I was about to order some chemical refills from TFTestkits.com but I now see three options and am confused which I need since I'm not ta the house where my kit is.
I need the chemical you put in after the DPD powder when testing for your FC levels (to get it to turn from red to clear). I thought it was the 0871 but I now am confused between the titrating reagent and the reagent since they are both 871....
a little help here.
They are the 0871 bottles at the bottom of this page TFTestkits.net