Well Cecil the good thing is that you have been doing the activites that pay for the sodium bentonite. : )
Granular is the right stuff to have for sprinkle method for sure.
I believe it can take up to 90 days for the bentonite to reach its max expansion, plus it needs to settle into the leaking areas... or be pulled into the seep by the outflow of the water. Oh and I read somewhere that water temperature plays a role in the activation of the sodium which in turn affects the swell rate.
Yep, checked out the site DD mentioned a year or so ago... but the pricing available in Texas made me too jealous... had to remove the bookmark to the page.
