camo,

Nope--no negative effects. I think the pellet gypsum works just as well as the powder.

The only drawback I can think of is that it might sink faster and not mix as well if just dumped in the water. But even in that case, it would mix later when the water is stirred up.

I think that if you apply the pellet gypsum in such a way that it can disperse and sink very slowly, it will give you the same immediate results as powder gypsum.

Good luck!

"Only after sorrow's hand has bowed your head will life become truly real to you; then you will acquire the noble spirituality which intensifies the reality of life. I go to an all-powerful God. Beyond that I have no knowledge--no fear--only faith."