Advanced Nutrients Bud Blood Powder 500 Gram Recirculating Chillers & Heaters Minimum operating pressure: 7 psi Foliar Applications Minimum operating pressure: 7 psi which is fine if you have no need for your trim or you already have one Feed Bud Blood Powder to your plants as soon as you switch to 12 hour lighting so your plants get the P and K they need for a successful bloom phase BUD BLOOD POWDER Give Your Plants A Head Start On Giving You Better Flowers Your plants need Phosphorus and Potassium (P&K) from the earliest days of bloom phase so they can maintain nutrient healthy roots vigorous growth sturdy stems and stalks and maximized production of flowers