DO Meters

In hydroponic growth systems, plants are grown in soilless media and receive all essential nutrients from a nutrient solution, including oxygen. Oxygen is required for aerobic respiration in plant root systems and to support a community of beneficial aerobic bacteria in the root zone. Oxygen is mainly supplied to the plant roots in the form of dissolved oxygen (DO) in the nutrient solution. Root growth and nutrient uptake are dependent on the concentration of dissolved oxygen.   For most plants, it is recommended to maintain DO concentrations above 5 parts per million (PPM) or 5 mg/L. If the amount of oxygen present in the root zone is inadequate, plant growth will become stunted due to underdeveloped roots and limited nutrient absorption. Insufficient oxygen levels can also promote undesirable bacteria and fungi growth. It is important to regularly test DO concentrations since factors such as temperature, root respiration and oxygen consumption can reduce DO concentrations. As the water temperature increases, the solubility of oxygen decreases. To maintain DO concentrations greater than 5 ppm aeration should be provided through the use of air pumps, oxygen stones/diffusers, the addition of chemicals such as hydrogen peroxide, or physically by rapid mixing.

We also sell high-quality portable meters such as EC/TDS Meters, pH Meters and hydroponic nutrients for your hydroponic growing systems. Visit in-store or order online at and get free delivery over $499. Only at HYDRO EXPERTS!