Power Si - 1 Liter Root Growth, FertilizerA little goes a long way with Power Si the original patented formula of monosilicic acid for plants. Power Si is proven to show benefits toward your crops yield, vigor, strength and lateral branching. Power Si does not raise the pH of your water and is tank stable, so its safe to leave inside your reservoir without creating any unwanted residue. Power Si can slow down vertical growth in crops with easy double dosage change to 1 ml per gallon of water.