Small NFT Hydroponics System

Step 10 Maitenance

The nutrients have to be changed periodically, and it's hard to tell when it needs to be done. People do it anywhere from once a week to once a month, and it depends on how much you mix at a time.

Hydroponics.net recommends that you add fresh water as it's used by plants, because even though water is absorbed, nutrients still remain, and can get more concentrated. They said that once you've added half the amount that was originally in there, it's time to change. So with my 7L, once i've had to add 3.5L of additional fresh water, the nutrients will be mostly depleted.

Some people also monitor their ph levels. Pool stores generally will check it for free. I don't have a lot of information on the subject to offer, however.

Other than that, there isn't a lot that you have to do except care for the plants as you usually would.

Comments

[Goudla]

Nice work!
At some point, while following interesting biology classes in highschool, I also got interested into that, and I seem to remember that by monitoring the pH and the electrical conductivity of the liquid (nutrients), it was possible to control it.
This even makes it possible to adapt it to the actual needs of the plant, which can vary depending on the actual stage of development of the plant.
Finally, if you can control, and adapt the composition of the liquid, you don't need to replace/through any.