DirectX: How to draw smooth 2D water (particle based water)

I recently got a water simulation using particles (1000-1500) working (using the stokes equation), but my problem is that I use a IDXSprite which just draws the particles using blue texture quads (7x7), that doesnt look very smooth.

Is there any way or known technique for drawing such systems so the surface will look smooth (and the water shou开发者_StackOverflow社区ldnt have the edges from the textures in it)