Sure to Grow Inserts are arguably the most technologically advanced hydroponic media ever produced. These products are manufactured from PET and as a result are pH neutral, sterile and inert. One of the most challenging concerns voiced to us by hobby growers is the need to maintain consistency in their grow rooms. Whether referring to temperature, humidity, dissolved oxygen, nutrient concentration or media composition, consistency is the key to growing success. STG provides the growers with a non reactive foundation on which they can tailor their own nutrient schedule without worry of media influence.