The first time I used the Faultless Heavy Duty starch, I got flakes. Then learned that I need to actually wait for it to get into the fabric. I have learned to walk away while it soaks in, get something to drink, do something else. If I jump in too quickly - the flakes show up again.
I do like Mary Ellen's Best Press - as I haven't had flaking problems with it. Though it is hard to argue the price difference.
I'll likely go the route someone suggested and use a coupon to get a gallon jug. It can join the jug of water already in the sewing room to refill the iron (though in honor of the Sprite in the iron thread - I will have to keep them way apart).
Cheers, K