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Learn To Adjust pH and EC in Hydroponics for Ideal Conditions

Learn To Adjust pH and EC in Hydroponics for Ideal Conditions

Water is of utmost importance in hydroponics, serving as the system’s lifeline. Its role is to transport nutrients and oxygen to the plants and regulate temperature.

Two of the most important aspects of hydroponic water are pH and EC levels. If they become unbalanced, the whole system goes off the rails.

Thankfully, adjusting the pH and EC levels of hydroponic water is a simple enough task once you learn how. 

How do you adjust pH and EC in hydroponics? The pH and EC levels in hydroponics are adjustable in a couple of different ways. The most effective method to adjust pH and EC in hydroponics is to use professional adjuster kits. The next best technique is adding household ingredients to the water that raise or lower levels.

If you’re new to hydroponics or need a refresher course on pH and EC-related subjects, read on below!

Hydroponic pH and EC – Differences Explained

The terms “pH” and “EC” are two of the most important terms that you must understand to fully grasp hydroponics. These two crucial measurements dictate how well your plants will do in general and if they will thrive or barely survive.

The H in pH stands for hydrogen. There is debate, however, as to what the p stands for. The main school of thought is that together, pH means “power of hydrogen,” and as power is simply a descriptive word, while hydrogen is the main focus, the p is little and the H is capital.

EC stands for Electrical Conductivity. It measures how much salt is found in your hydroponic water, and how much electric current is possible.

The pH level measures the acidity of the water.

Together the pH and EC determine how much hydroponic nutrients are available for your plants.

Hydroponic pH Value Explained

The pH level of your hydroponic water is vital for success at growing virtually anything. Depending on the level of the pH, the amount of nutrients in the water differs as does the ease at which the plants can absorb them.

Furthermore, every plant is unique and requires a specific pH range to grow and flourish. So, pH control is incredibly important to understand, especially if you grow more than one type of plant.

What Happens to Plants If the pH Is Too Low?

When pH levels drop lower than they should be for a certain type of crop, a gap in the needed nutrients occurs. Additionally, with lower pH, serious deficiencies in calcium and magnesium appear as well as toxicity from copper and iron.

That means that your plants may very well die if you don’t increase the nutrient solution pH to safer levels rather quickly.

Ensure you can identify Cal-Mag deficiency and understand the significance of Cal-Mag for plants!

What Happens to Plants If the pH Is Too High?

When pH levels are too high this indicates alkalinity, and plants aren’t able to easily absorb nutrients that are present in the water. A high pH of the nutrient solution may also cause nutrient deficiencies in iron or calcium.

That means when the pH is higher than it should be, your plants can die due to not being able to get the food they need, even if it is available.

Recommended pH Values for Common Hydroponic Plants

Different plants have varying pH preferences that affect their ability to access essential nutrients. The following recommended pH ranges are based on the natural preferences of each plant for nutrient uptake and assimilation.

Regular monitoring and adjustment of pH levels in the nutrient solution will help ensure that plants receive the right balance of nutrients for optimal growth and productivity in hydroponic systems.

Hydroponic EC Explained

The EC measurement of your hydroponic water is crucial as it basically allows you to gauge how much nutrients are available in your water. Furthermore, it gives you a clear idea of how easily your plants may absorb the present nutrients.

How Does EC Affect Plant Growth? 

If the EC in your hydroponic growing system is on point, your plants are safe. But, when the EC is too high, or too low, they are in danger of eventually starving to death.

What Happens If EC Is Too High?

When EC in your water is too high, it causes something similar to a draught. Regardless of how much nutrients are available in the system, roots simply aren’t able to function properly and absorb the needed nutrients and water.

In other words, a high EC level causes plant growth to slow, and eventually come to a total stop. If the EC level isn’t corrected in time, the plants will go into shock, start losing leaves, shut down completely, and then die.

How Does EC Affect pH? 

Technically speaking, EC and pH aren’t related to each other. However, the two are closely intertwined as EC does affect the amount of nutrients plants are able to absorb.

Recommended EC Values for Common Hydroponic Plants

Maintaining appropriate EC levels ensures that plants receive an optimal balance of essential minerals for growth and development.

The following recommended EC ranges are tailored to the nutrient requirements of each plant, ensuring that they receive an appropriate concentration of nutrients for optimal growth and yield. 

What Is TDS in Hydroponics?

The TDS is the measurement of salt concentration and the strength of nutrients available in hydroponics. That means that TDS readings allow you to measure the total of all substances dissolved in your water.

Generally speaking, TDS levels should read between 600 and 1200 in hydroponic systems. That said, each crop requires a specific TDS level.

Is EC the Same as TDS?

EC and TDS are similar only in the fact that they both provide a measurement of how much salt is present in your hydroponic water. That is where the similarities stop, however.

EC is primarily a measurement of electrical conductivity, TDS is primarily a measurement of all combined dissolved solids found in the water.

Testing pH in Hydroponics

Measuring the pH using a digital ph meter is the most common way the water pH is measured in hydroponic systems.

To check the pH, all you need to do is power the meter up and hold its probe in the water. 

Alternatively, the pH measurement is also testable by measuring its chemical reaction on paper strips. This second method may be old fashioned by today’s standards but is nearly as accurate as most meters.

Testing EC in Hydroponics 

Tests for EC in hydroponics are extremely similar to pH testing. They are typically carried out with EC meters. 

One difference between the two meters, however, is that EC meters work with two electrodes rather than a single probe. Once placed in the water, the two electrodes measure the level of electric conductivity between them.

The Importance of Temperature in Hydroponics

Temperature plays a critical role in small-scale hydroponics as it directly influences the health, growth, and overall performance of plants.

It affects various aspects of the hydroponic system, including the roots, nutrient solution, and pH and EC levels, regardless of the substrate or growing media you use. Here’s how temperature impacts each of these components:

Root Health and Growth

The temperature of the root zone, where plants absorb water and nutrients, is crucial. It should be kept within a specific range to promote optimal root growth and nutrient uptake. Generally, a root zone temperature of around 64-72°F (18-22°C) is considered ideal for most hydroponic plants.

Roots that are too cold can lead to slower growth and reduced nutrient absorption. On the other hand, if the root zone becomes too warm, it can result in root stress, reduced oxygen availability, and increased susceptibility to root diseases.

Nutrient Solution Temperature

The temperature of the nutrient solution directly affects the solubility of nutrients. Warmer solutions can hold less dissolved oxygen, potentially leading to oxygen deficiencies in the root zone.

It’s recommended to maintain the nutrient solution temperature within the range of the root zone temperature (64-72°F or 18-22°C). This can be achieved through temperature control systems like water heaters or coolers.

The pH and EC Levels

  • pH Fluctuations: Temperature variations can influence pH levels in the nutrient solution. Higher temperatures can lead to pH levels drifting upwards, becoming more alkaline. This can affect nutrient availability to plants.
  • EC Changes: Higher temperatures can also impact the electrical conductivity (EC) of the nutrient solution. As water evaporates due to heat, the concentration of dissolved nutrients can increase, affecting the EC levels.

Managing Temperature in Home Hydroponics

To ensure successful growth in home hydroponics, it’s important to manage temperature effectively:

  • Insulate the hydroponic system to help maintain stable temperatures in the root zone and nutrient solution.
  • Use water heaters or coolers as needed to regulate the nutrient solution temperature, especially in extreme weather conditions.
  • Regularly monitor both root zone and nutrient solution temperatures using appropriate thermometers.
  • Shading: If your hydroponic setup is exposed to direct sunlight, provide shading to prevent excessive heating of the nutrient solution.
  • Proper air circulation can help maintain consistent temperatures and reduce the risk of root zone overheating.

Best pH and EC Meters

Hanna Combo pH/EC/TDS Combo Tester

The Hanna Combo Tester works not only for measuring pH and EC levels, but for reading TDS, C, PPM, and temperatures as well. The meter is well-made with a long-lasting battery, auto-shutoff, and two sets of memorized buffers for auto-calibration.

The unit has a sleek design, easy to grip, with waterproof materials that float. So, even if you happen to drop it in the water, it will still work perfectly the next time.

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  • Measures pH, EC, TDS, and more
  • Waterproof and floats
  • ATC ability
  • Auto calibration
  • Long-lasting


  • Expensive compared to other meters

Extenuating Threads pH and EC Tester

A popular duo of testers, the yellow meter measures pH and the blue one reads TDS, PPM, and EC. The units both feature auto-locks, yield quick results, and have small compact designs. They are also lightweight

These meters are accurate, give fast readings, and are super easy to use. Even more, both of the Extenuating Threads pH and EC Testers are built for use with pools, spas, in addition to hydroponic and aquaponic systems.

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  • Quick results
  • Accurate
  • Easy to use
  • Comes with two meters
  • Reads pH, EC, TDS, and PPM


  • Not as heavy-duty as some meters

Apera Instruments 5-in-1 Tester

Another heavy-duty and highly accurate (albeit expensive) pH and EC meter is the Apera Instruments 5-In-1 Tester. Waterproof, easy to use, the unit features a bright LED screen with pushbuttons.

This meter has a dual display, displaying the water temperature alongside the specific reading you are taking. The unit also comes with a calibration kit ready to use, so hardly any time is wasted keeping the meter as accurate as possible.

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  • 5-in-1 design
  • Large easy to read screen
  • Dual display
  • Takes AAA 
  • Multi-parameter probe


  • More expensive than other meters

How Often To Measure pH and EC 

The pH and EC levels in hydroponics requiring measuring daily. Make sure to check both the pH and EC simultaneously, regardless of what time of day you perform your tests.

Ideal pH and EC Levels for Most Plants

A standard temperature for hydroponic water is 72 to 75°F, the pH should be between 5.5 and 60 with an EC of 1.2 to 2.0. Depending on the crops you’re growing or plan to grow, optimal pH and EC levels differ from species to species.

Adjusting pH in Hydroponics

The pH level in hydroponics is relatively easy to adjust. But, you must keep a couple of items on hand to do so. If you’re growing plants in a hydroponics system, there is no other option.

The first item is a pH level adjuster kit that comes with two to three pouches of powder, or bottles of liquids. The adjusting agents are concentrated nutrients that instantly raise, neutralize, or raise your water’s pH level when added.

The alternative way to adjust pH levels in hydroponics is by adding household items that contain the same sort of nutrients needed. Adjusting pH in this manner isn’t the easiest route to take, therefore isn’t highly recommended.

Adjusting EC Levels in Hydroponics 

The EC level in hydroponics is even easier to adjust than pH. If the EC is too low, simply add some liquid fertilizer, plant food, or nutrients. 

You could also change all of the water in the system, replacing it with fresh clean water and proper nutrients.

How To Reduce EC in Hydroponics

On the other hand, if the EC in hydroponics is too high, add water to the system. Make sure the water is clean and top off the tank. 

If, however, there isn’t enough room to add water (because the tank is already full), you’ll need to scoop out some of the water first.

Related Questions: 

Does pH Up Raise EC?

Adding nutrients to an EC that is lower than it should be raises the electrical conductivity of the water. The pH affects EC in this manner due to the extra salt content that it adds to the water. 

The more salt, the higher the conductivity of electricity in the water.

How Accurate Are EC Meters? 

EC meters can be extremely accurate. That said, the quality of the meter is a huge factor in how accurate it is. 

Another significant factor is how well cared for the meter is. It is highly suggested that EC meters are calibrated for accuracy once every 10 to 15 days on average. 

If you install new electrodes, drop the unit, or use a meter for the first time in a long while, it should also be calibrated then.

Key Takeaways

The pH and EC levels in hydroponics are equally crucial for hydroponic growers, and you have the ability to easily measure and adjust both of them. 

An imbalance in either level may cause the untimely death of all crops grown in an otherwise perfectly cared for and well-functioning hydroponics system.

Remember to test pH and EC in your hydroponic water on a daily basis and adjust them as soon as possible, and you’ll do just fine.