Check the listing for details. General Hydroponics pH Down Liquid Premium Buffering For Stability, 1-Gallon. Color: Orange, Condition: New. Listed at 43.99 USD. General Hydroponics pH Down Liquid Premium Buffering For Stability, 1-Gallon Features Acid formulation uses food grade phosphoric acidAdd when your nutrient pH is too high in order to lower the pH to the proper levelPromotes pH stabilityAdjust by adding a little at a timeRecommended pH for most plants is 5.5 to 6.5 pH Fast and Free Shipping You're already purchasing the item. Why pay additional for shipping, especially slow shipping? We get your order shipped out within 1-business day and delivered to your doorstep as quickly as possible. Competitive Pricing With our dynamic pricing model, our prices are always competitive. Our prices are some of the lowest that you will find on the internet. Rest assured that you're getting a good deal when purchasing with us. 30-day Money Back Guarantee We are committed to making sure that you leave this transaction satisfied. If you're unhappy with the product for any reason, you may return it back for your money-back or a replacement within 30 days. No questions asked!