As the title says my BRS soda ash is crystaling while mixing with rodi water, not all of it, there are several hard crystals that form during the mixing. I mix it slow and stir as i am adding the soda ash, I have my own RODI unit and recently change the filters. I use an Immersion Blender to break up the crystals, I don't remember this happening before could it be that the water is cold?