How Often To Change Hydroponic Water

Table of Contents

If your plants are growing well, they’re thriving on the nutrients in the water you’re providing them. However, every plant doesn’t grow at the same rate or in the same conditions. Some require more water than others, so changing your hydroponic water regularly is one of the most important things you can do to ensure your plants get everything they need.
Maintaining healthy hydroponic soil is just as important as maintaining healthy hydroponic solution. When you change your solution regularly, it forces excess salts and minerals from the old water into the new one so that it has a balanced pH and is free from impurities that can harm your plants. Each time you change solution, you also re-introduce air to your system to allow for new root growth and discourage algae blooms and root rot from forming in stagnant solution.

How often should you change your hydroponic water?

It’s difficult to say exactly how often you should change your hydroponic water, because it depends on the kind of plants you’re growing, the size of your system, and other factors. Generally, it’s recommended that you change your solution every week or two for small systems and every month or two for larger ones. If you want to be extra sure that you always use fresh water, consider adding an in-line filter inline with your system.

I recommend changing your hydroponic water every 2 weeks.

What makes good water for changing?

A good hydroponic solution has a balance of nutrients, pH, and relative salt levels. It should also have the right amount of aeration to prevent algae and root rot.
A hydroponic solution should be more acidic than the soil in which it’s grown. This is because plants need an acidic environment to thrive. If you’re growing your plants in soil, you want this pH level to be slightly higher than that of the soil so that your plant doesn’t become too comfortable with it and stop making as much use of the nutrients it needs in the water.
Some plants like hard water while others don’t. There’s no way to tell if a plant likes hard or soft water unless you try both out and see which one your plant prefers.
Having a balanced pH is important for maintaining healthy roots and keeping algae at bay. Softer water means that there will be less dissolved minerals for your roots to use, so they remain healthier longer. Harder water allows for more minerals to dissolve into the solution, so over time its pH becomes more balanced with time as it breaks down any excess salts from old solutions.

Choosing a new hydroponic water formula

The best time to change your hydroponic water is when it’s at its peak. When you do this, you’ll see the plant’s growth accelerate and their leaves rejoice. However, if you want to plan your watering schedule better, you can change your hydroponic water every two weeks.
If you don’t have a specific schedule in mind, changing your solution every 2-4 weeks is a good idea. This will ensure that your plants get the water they need and reduce the risk of mineral buildup or algae blooms from happening.
If you’re growing with an air-pump system, changing once every four weeks is a good way to go about things. These pumps circulate fresh air through the solution before it gets absorbed into the soil, preventing any buildups of salt or minerals and ensuring that everything stays clean and fresh for growing.

How to test your current water

Now that you know how important it is to change solution every day, how do you test your current solution? There are a few ways:

1) Test the pH of your hydroponic water. If your pH is too high or low, this can indicate that you have too much or too little nutrient in the solution.
2) Test the nutrients in your hydroponic solution by performing a water analysis. This will tell you what’s in there and how much of it is present so you can make sure there’s enough for both plants and soil.
3) Test the hardness of your water by testing its specific gravity with a hydrometer. Hardness ranges from 1 to 30; soft water has a specific gravity of less than 1 and hard water has a specific gravity of greater than 1. You want something between 2-7 if possible because anything above 7 will be difficult for plant roots to process without damage.

Check the PH of your current water

If you’re using a hydroponic system, the PH of your water should be around 5.6 to 6.8 pH. If it’s too high or too low, it can cause a variety of issues in your garden like:
– Algae blooms
– Nitrate accumulation
– Salt accumulation
– Root rot
– Phytotoxicity (when plant roots are exposed to toxic substances).

Replace with more acidic solution

Replace your hydroponic solution with a more acidic one every week. As you do this, you should also monitor the pH of your solution and keep it around 5.8-6.2 if possible. If your water is too alkaline, you can use vinegar or lime to reintroduce acidity into the system.

Replace with more alkaline solution

After you’ve changed your hydroponic solution, the next step is replacing it with more alkaline solution. If you want to keep your pH balanced and your nutrient levels high, you need to change the water often.
Alkaline solution has a higher pH than acidic and should be used sparingly because too much of it can lead to plant burn or mineral deficiencies. You don’t have to replace all of your solution at once; simply swap out a portion every week or two. In general, it’s best to swap out about one-third of your old water for fresh new water every week.

Summing up

We recommend changing your hydroponic solution at least every other day to make sure that the plants get everything they need.


How can you tell if your hydroponic solution is balanced?

When your plants appear to be flourishing, it’s an accurate representation of how the nutrients in your hydroponic solution are balanced. When the roots of your plants are drinking water, it is because the roots are being nourished by the nutrients in your hydroponic solution. If your plants aren’t growing well or aren’t thriving on the nutrients in your hydroponic solution, then you can likely adjust the amount of nutrients in the hydroponic solution (by adding or removing more or less nutrient-rich water) so that your plants drink more or less water. In this way, you can make adjustments to make sure that everything is in balance within your hydroponic system.

What are the benefits of regularly changing your hydroponic solution?

The most important thing to know about changing hydroponic solution is that the plants will not immediately thrive on the new water. While the plants will certainly start to use the nutrients from the old water and begin to use them more efficiently, it can take several days or even weeks for them to fully recover from the effects of holding on to old water. During this period, your plants may appear slightly weaker than usual.
While waiting for them to recover from adaptation, it’s especially important that you keep a close eye on how much water you’re adding to your reservoir. In some cases, it may take a few changes of your solution before you begin to see results again.

If you have a spare reservoir available, you can use that as a test tank to ensure you’re dosing your plants correctly and giving them what they need. It can be helpful to use this test tank as a reference when making adjustments in the main tank so that you know exactly what’s going on with your plants. It’s also a good idea to consider using different nutrients in your test tank if possible so that you can get an idea of what effect they have on growth rates.

What are the consequences of not changing your hydroponic solution regularly?

There are a few negative consequences of skipping your hydroponic solution’s watering cycle. First and foremost is that the nutrients within your water will begin to break down, turning into less effective compounds. Second, your pH imbalance will increase. And third, the microorganisms and enzymes in your hydroponic solution will die off. If you water your plants only when you need to, you might only water them once a week. This means they’re getting far fewer nutrients, a lot more toxic minerals, and generally not getting what they need to thrive.

If your plants aren’t growing well, one of two things may be happening: either they aren’t getting enough nutrients, or they aren’t getting the correct balance of nutrients in their hydroponic solution. Either way, it’s likely because you’re not maintaining the water properly and it’s likely because you’re not maintaining the pH balance of your solution properly.

Finallypletingly water every time you change your solution means that you’ll always know that your pH is balanced, that all the beneficial microorganisms are active, and that there aren’t any dangerous toxins present in the water. It also prevents any of these problems from developing in the first place.

Shaun Anderson

Shaun Anderson

I love my garden, especially growing my own (and my family’s) food, so I decided to go into Hydroponics and learn all that I can on the subject.

Join me on this journey and discover how it all works.

Pleople who read this article also liked:

Recently Published

A Simple Hydroponic System You Can Build