pH Balancer is used to adjust the acidity of your water so that your plants can efficiently absorb nutrients from it. The pH of water varies from 5 to 9 based on your source. pH balance helps bring it to 5.5 to 6.5 which is the ideal range for most plants.
General Hydroponics pH control kit contains 8 ounce pH up, 8 ounce pH down, 1 ounce indicator and vial.