help with Hanna phosphate checker

[Reef Pilot]

Originally Posted by straightrazorguy

Maybe I'm slow, but I cannot fill vial, add ALL the reagent in the pouch, and completely mix it in 3 min. At the end of 3 min I still have solid particles of reagent swirling in the vial. I don't want to measure it unless it's completely dissolved. That's why I use 2 vials.

What do you mean fill the vial?? That is done at the beginning before C1. I also have the packet cut, funnel formed and ready to pour before the 3 min time limit begins. I usually use close to the full 3 min before pressing (and holding) C2, but have no trouble completely dissolving the powder.