In Aquaponics the water parameters must be maintained in the appropriate range. When we talk about water parameters we generally refer to the 3 molecules of the nitrogen cycle, the oxygen concentration and the pH. Today we will focus on the pH, I will give you key information in order to manage it easily. Too many of us forget that pH fluctuations can have a dramatic impact on the fish, the bacteria and the vegetables. Generally speaking the bacteria prefer a pH that is slightly high (above 7) while some vegetables prefer a pH below 7. In Aquaponics we deal with a whole ecosystem and therefore we try to maintain the pH close to the neutrality that is to say around 7. We will see how to increase the pH thanks to some egg shell and baking powder (composed of bicarbonate sodium). We will also highlight the fact that the aquaponics media must be selected carefully, we will use the vinegar technique to check the limestone presence into the media. Many people use pure acids such as citric acid and phosphoric acid in order to decrease the pH. We will see why it can be risky and how to decrease the pH in good conditions. In this video you will learn what the KH (Carbonate Hardness) is and the GH (General Hardness). You will understand the buffering effect and we will make the comparison with a sponge to illustrate the KH role into the pH evolution. Without being to scientific we will see that pH is actually a representation of the ions H+ and OH- into the water. After watching this video you will be able to analyse your water pH, determine if it’s a basic or acidic pH and regulate and control the pH in total safety for the ecosystem. You will also take advantage of the pH drop to increase the aquaponics water mineral concentration and therefore offering calcium, magnesium and other ions to your plants. You will also learn how to test the KH of your water and regulate this parameter in order to take advantage of the buffering effect. In this video we will not develop the techniques used by aquarium keepers such as using reverse osmosis as it’s a costly and non ecofriendly technique that waste water and energy. Peat can still an option to decrease the water pH but it takes a bit more time and colour the water. Enjoy the video and make sure to subscribe to the channel