help with Hanna phosphate checker

[straightrazorguy]

Originally Posted by Amadod2

well im trying to get my water to .05, i have also read that you shouldn't have any air bubble in the vile.

3min seems to be a bit much it terms of the sample diluting, it takes at least that long to get it to dissolve

I know, but the difference between 0.10 and 0.17 puts it in the same ballpark. It's not an order of magnitude difference.

Where did the 3 minute rule come from? It takes me longer than 3 minutes to dissolve all the reagent floaties.