How Often Should You Change the Water in Your Hydroponic System?

If you’re new to hydroponic gardening, you’re probably wondering, “How often should you change the water in your hydroponic system?” Generally, you should change the water in your hydroponic system every two weeks. However, this depends on your system. Some may require more frequent or lesser changes to maintain pH level, nutrients, and cleanliness.

For your plants to grow healthy, you need to make sure that they’re getting the appropriate nutrients. While it may seem that draining and replacing the solution cost time and money, it’s necessary to ensure that your system maintains the right nutrient balance for your plants to thrive.

If you don’t change the water as often as you should, the nutrients, pH levels, and other ratios will be thrown out of balance. An imbalanced ratio can impede the growth of your plants and encourage the development of harmful organisms, creating an environment that could end up killing your plants.

How Often Should You Change the Water in Your Hydroponic System

How to Top Off Your Solution

As your plants grow in the hydroponic system, you’ll notice that the water slowly depletes every day, thanks to vaporization and transpiration. To prevent total loss of water, you can top it off, so the volume remains consistent. You can add a little water to your solution intermittently to keep the volume up.

This process is more commonly known as “topping off,” where gardeners gradually add water to the hydroponic solution to maintain water volume. Nutrients like zinc, copper, and nitrogen don’t quickly evaporate as water does. If these nutrients are too concentrated, it can harm your plants.

The top off frequency depends on you, but every two to three days is a suitable measurement. You can do it every day if you want to. Remember that it’s essential to measure how much water you top off; otherwise, you risk changing the solution. For example, if you have a 10L reservoir and add a liter per day, you can do a full change after ten days.


How to Change the Water in Your Hydroponic System

You can’t top off your hydroponic system forever. Over time, you’ll need to do a full change to ensure that your plants stay healthy. To ensure that your plants are getting the right amount of nutrients, you need to regularly change the nutrient solution instead of just topping it off. Here’s how you can do it:


Step #1.

Remove the growing tray from your hydroponic garden.


Step #2.

Drain the previous nutrient solution into the waste bin.


Step #3.

Clean the empty container with a scrubber to remove any remaining nutrient deposits.


Step #4.

Wash the container with water to further remove the nutrient deposits that may have been dislodged as you were scrubbing.


Step #5.

Refill the container with the nutrient solution.


Step #6.

Place your plants and growing trays back into the system.


Reasons Why You Should Change Your Hydroponic Solution

If you’ve made significant changes to the nutrient ratio, you’ll need to thoroughly flush out your tank and start with a new solution. Another reason why you should change your hydroponic solution is when you see visible signs of unhealthy plants or bacterial growth.

Be sure to keep an eye out for chlorosis or when the leaves of your plants turn yellow. You should also watch out for necrosis or the wilting and death of certain sections of leaves and roots, and purpling which happens when you see a purple-like tint all over your plants. Furthermore, you should also observe for stunting or when some parts of your plant are growing slower than the others or when the entire plant exhibits delayed growth.


Why Should You Place Your Hydroponic System Inside a Greenhouse?

If you’ve done a little research about hydroponic gardening, you’ll find out that most gardeners use a greenhouse for it. Here are some of the reasons why:


Protect your plants from harmful pests

With a hydroponic garden, the risk of attracting harmful insects is much lower. However, insects can still infest your garden, and once they’re in, it can be quite challenging to remedy the situation. Placing your hydroponic garden inside a greenhouse provides an added protection that keeps those pesky critters away.


Control the growing environment

A greenhouse allows you to control the climate inside. You’ll be able to create your own microclimate and grow different types of plants regardless of where you live. Maintenance will also be more comfortable because you won’t have to till the soil, pull weeds, or pushing wheelbarrows.


Maximize space

Hydroponic gardens in a mini greenhouse maximize space, and it even increases the yield of your plants. This gardening system uses less space compared to soil-based gardens because you can plant your crops close together.

Additionally, the standard size of a mini greenhouse is around six feet. You can even opt for smaller ones if you want to save more space. You’ll be able to place your mini greenhouse anywhere you like – balconies, patios, desks, or even on tables.


Conclusion: How Often Should You Change the Water in Your Hydroponic System?

So, how often should you change the water in your hydroponic system? Every two to three weeks is a good rule of thumb, but this depends on several factors, including how often you top off and how much water you put in.

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How To Prevent Root Rot In Hydroponics: 3 Useful Tips

If you’re a newbie gardener who’s looking to find ways to hone your skills, you’d want to learn how to prevent root rot in hydroponics even before this problem affects your plants.

Hydroponics can be advantageous to crops in more ways than one. However, it also comes with risks of diseases, such as root rot, which can be destructive or even lethal to your plants.

Unfortunately, there are no effective methods to recover the wilted parts that were affected by the root rot once it hits your plants. The only thing you can do if you do not want this catastrophe to befall your crops is to prevent it before it happens. Read on to learn more about this subject.


What is Root Rot?

Root rot is a disease that attacks the plant roots and causes them to suffer decay. This usually happens when a lack of oxygen supply occurs in the substrate.

To give you an idea, think about plant roots that are submerged in water that only has a little oxygen in it. Over time, the plant suffocates and dies.

Aside from rot and decay, this disease also leads to the proliferation of fungi that are naturally present in the soil. These include Rhizoctonia, Alternaria, Pythium, Botrytis, Fusarium, or Phytophthora. As soon as fungi colonies start to grow, they tend to target the weakened roots and infect your precious plant babies.

Once the plant becomes infected, they won’t be able to take in what they need to grow – water, oxygen, and other nutrients. When this happens, it won’t be long before the plant dies.


What is Hydroponics?

In case you’re not aware, the term hydroponic is derived from a Latin word that means “working water”. To put it simply, hydroponics is an art that involves growing various types of plants without soil. If you’re like most people, the first thing that comes to mind when somebody talks about hydroponics would be a picture of plants with roots suspended into the water without using any type of growing medium.


Avoiding Root Rot in Hydroponic Systems

Detecting and identifying root rot can be tricky. When your plants get infected, their leaves and roots gradually wither until the whole crop itself dies from the lack of nutrients, which is a common symptom of many diseases.


What causes root rot in hydroponics?

One of the requirements in hydroponics systems is oxygen. Without it, your plants are basically on the road to death. On the other hand, lack of such is one of the major triggers for root rot, and it must be avoided at all costs.

Just like when planting in soil, you loosen up the ground so that your plants’ roots can have their required intake of oxygen. That is the case for crops grown in aqueous solutions as well. If they cannot breathe, they would not be able to grow.

Another agent for root rot is the temperature. The last thing you would want in your system are parasites that leech nutrients intended for your plants and infect the water during the process. In common terms, these fungi are called molds.

One of the best breeding grounds for these is warm and moist areas. For this reason, if the water temperature inside your reservoir is high, then you are susceptible to it. Something as minor as letting the solutions exposed to sunlight can already be a risk factor.


3 Useful Tips on How to prevent root rot in hydroponics

There is good news! Root rot in hydroponics can be prevented! Just follow these tips:

Tip#1: Use the right air pump

If you do not want root rot to affect your plants, you merely have to avoid its causes. If you need oxygen, keep the water bubbling by providing an air pump of appropriate size, and also give importance to proper ventilation in the room.


Tip #2: Maintain the temperature

The temperature should be maintained within the 70 to 80 degrees F range. Get rid of any materials that can make your system vulnerable to infections, and make sure not to disturb your crops while they are trying to grow.


Tip #3: Get rid of the rotten parts

However, if you failed in preventing the disease, then the rotten parts should be removed immediately. Cut them off as there is no chance of reviving them, and focus on the potential new growth instead. Fix your hydroponics system and eliminate the risks.


Why Give Greenhouse Gardening a Try?

Greenhouse gardening offers numerous benefits to greens aficionados who dare to take their gardening experience to the next level. Aside from acting as a shield against the effects of inclement weather, a mini, hobby, or semi-pro greenhouse can also serve as a protective layer that keeps harmful bugs and critters at bay.

What’s more, its enclosed structure allows you to control your plants’ growing conditions including the temperature, light, moisture, and ventilation of the greenhouse’s internal environment. With a controlled environment, you’ll be able to extend growing seasons and grow plants that aren’t native to your area.



No matter how well-informed you are about how to prevent root rot in hydroponics, you cannot completely eradicate the risks. Therefore, to avoid the worst-case scenario, you should be prepared to sacrifice the infected for the sake of others. While you’re at it, consider trying your hand at greenhouse gardening as well.


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