Lythic Densifier’s highly reactive colloidal silica fills concrete’s pores and capillaries, adding to the calcium hydrate reaction. Green concrete treated with the product results in a stronger, more durable material. It has a lower pH, so it is safe to handle, penetrates quickly, and does not leave a dangerous residue. The densifier emits no VOCs and contains no harsh chemical solvents. Lythic Solutions Inc. 360-694-5347.