( PACK OF 4) The FoxFarm Cultivation Nation pH Down is a concentrated liquid solution in a 16oz bottle designed to lower the pH of nutrient solutions for hydroponic systems and gardening. Made in the United States, it is specifically formulated to adjust the pH levels of water and nutrient mixes to ensure optimal conditions for plant growth. With a weight of 1 lb per bottle, this pH Down product is not organic and contains specific ingredients aimed at regulating pH levels for various types of plants. This pack includes 4 bottles for convenience and ease of use. if you have any questions just send us an email. Thanks for looking!