---
title: 13. How to manage EC and pH on a day-to-day basis in hydroponic cultivation
description: Managing EC and pH every day is the key to stable and productive hydroponics. Learn how to control, correct and simplify their management with Tomato+.
image: https://tomatoplus.com/hubfs/TANGO_78A6797.jpg
---

 Nov 24, 2025 6:52:15 PM

# 13. How to manage EC and pH on a day-to-day basis in hydroponic cultivation

[ Tomato+ Team ](https://tomatoplus.com/en/blog/author/tomato-team)

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13. How to manage EC and pH on a day-to-day basis in hydroponic cultivation

7:16

 

This article is part of the practical series on hydroponics, designed to take you step by step from theory to daily management of your plant.

Managing **EC** (Electrical Conductivity) and **pH** well every day is the difference between plants that "survive" and plants that explode with growth. It is not enough to set the values once: the nutrient solution is a dynamic system that is constantly changing.

Let's see **what happens day by day**, how to read the values, and what to do-practically-when they are not where they should be.

---

## Why EC and pH change every day

Even if you don't touch anything, EC and pH **never stay perfectly still.** Here's why:

- **Plants selectively absorb nutrients**  
  They don't "drink" everything evenly: at some times they absorb more nitrogen, at others more potassium, calcium, etc. This unbalances the solution.
- **Water evaporates or is transpired**  
  If water decreases and salts remain, **EC rises**.
- **Natural chemical reactions**  
  Some nutrients tend to slightly change pH over time.
- **Incorrect top-ups**  
  If you add only water, EC goes down; if you add only fertilizer, it goes up too much.

So managing EC and pH is a **daily process**, not a one-time setting.

---

## How often to check EC and pH

It depends on the type of plant and the level of automation.

### In a small hobbyist system.

- **At least 1 time per day**, preferably:
  
    - **Morning**: main check
    - **Evening**: brief check, especially in summer or very bright lights

### In a professional or very dense plant

- Checking **2 times a day** is standard.
- In case of fast cycles or "sensitive" plants (baby leaf, microgreen, tender basil): even 3 checks per day at critical times (early stages after transplanting or in heat peaks).

### In Tomato+ systems.

In more advanced systems, such as **Horto Professional**, monitoring of key parameters is integrated into automated management, minimizing manual operator intervention.

---

## What values to keep in mind (in general)

"Perfect" values depend on the crop, but for a **general foliar** (lettuce, misticanza, basil, baby leaf) you can consider as an indicative reference:

- **Indicative EC:** 1.2 - 2.0 mS/cm
- **Indicative pH:** 5.5 - 6.5

Important:

- always stay **within the nutrient solution manufacturer's recommended ranges**;
- if you use Tomato+ pods and nutrients, follow the crop-specific directions in our technical documentation.

---

## What it means when the EC changes

### 1. EC goes up

Possible causes:

- Plants drink more water than salts (classic with hot climate).
- There is **evaporation** (very hot greenhouse, little air exchange).
- You have added too much concentrated solution.

What to do:

- Add **water (better demineralized)** to bring EC back into range.
- Check for salt deposits near the roots or in the tanks.

### 2. EC drops

Possible causes:

- Plants are growing rapidly and absorbing lots of nutrients.
- You have topped up too many times with water only.

What to do:

- Add **nutrient solution** (or fertilizer) following the recommended doses.
- Proceed in small steps: add, mix, wait a few minutes and measure again.

---

## What it means when the pH changes

### pH rising (the solution becomes more basic).

Possible causes:

- Preferential uptake of certain ions by roots.
- Characteristics of the starting water (e.g., very hard water with natural buffers).

What to do:

- Use **pH down** (generally based on hydroponics-specific acids).
- Add drop by drop, mix well, **wait 5-10 minutes** and measure again.

### pH going down (solution becomes more acidic).

Possible causes:

- Type of fertilizer used (some acidify).
- Accumulation of some forms of nutrients.

What to do:

- Use **pH up** (specific basic solution for hydroponics).
- As above: small steps, never aggressive corrections all at once.

---

## Daily routine: simple checklist

You can use this **daily routine** for any basic hydroponic system.

### Every morning

1. **Check the water level.**
   
     - If it is low, top up with water (better demineralized if possible).
2. **Measure the EC**
   
     - If it is:
       
           - **in range** → ok
           - **too high** → add water
           - **too low** → gradually add nutrient solution
3. **Measure the pH**
   
     - If it is:
       
           - **5.5-6.5** (for foliar) → ok
           - **over the range** → correct with pH up / pH down
4. **Mix the solution well**
   
     - Simply by circulating the water for a few minutes with the pump.
5. **Observe plants**
   
     - Yellowing leaves, burnt edges, slow growth? Signs that EC/pH may not have been optimal in previous days.

### Every evening (quick check)

- Quick check of:
  
    - water level,
    - EC,
    - pH.
- If values are stable, no need to intervene-your system is in balance.

---

## Mistakes to avoid in daily management

1. **Aggressively correcting**
   
     - Going from pH 7.0 to 5.7 in one big correction is a classic mistake.
     - Better 2-3 small adjustments, measuring in between.
2. **Measure immediately after adding fertilizer**
   
     - Always wait a few minutes for the solution to homogenize.
3. **Uncalibrated instruments**
   
     - An uncalibrated pH meter is worse than no meter at all.
     - Keep buffer solutions and calibrate it periodically.
4. **Ignoring water temperature**
   
     - Temperatures too high or too low will alter the reading and the condition of the roots.
     - (Water temperature will be the topic of article 17 in the series.)
5. **Changing too many things at once**
   
     - If you change EC, pH, photoperiod, and LED distance on the same day, you won't understand what really made a difference.

---

## How Tomato+ simplifies EC and pH management.

### Horto2 and Horto4: simplified management for everyday use

In the **Horto2** and **Horto4** greenhouses, designed for kitchens, restaurants, and small laboratories, we have minimized complexity:

- **Demineralized water** is used.
- You add a **unique pre-dosed granular** solution designed to automatically bring the solution into the correct parameters for most pod cultures.
- If you follow the directions (level, amount, replacement times), **you don't need to intervene every day on EC and pH-the** system is designed to be stable and repeatable.

This makes hydroponics accessible even to those without technical experience.

### Horto Professional: advanced control and data

With **Horto Professional**, designed for producers and researchers, EC, pH and microclimate management enters **data-driven** logic:

- Integrated sensors and remote controls.
- Analysis of growth data and environmental conditions.
- Automation of crop parameters through **AI** and dynamic growth plans.

The goal is to reduce human error, standardize results, and enable multiple cycles to be run in parallel with maximum consistency.

---

## In summary.

- EC and pH are **dynamic variables**, not numbers to be set once.
- Daily management is based on:
  
    - regular measurements,
    - small corrections,
    - plant observation.
- Systems like those in Tomato+ allow you to:
  
    - **simplify** management (Horto2, Horto4),
    - **automate and optimize it** through AI (Horto Professional).

If you learn to read EC and pH on a day-to-day basis, you stop "putting out fires" and really start **guiding** cultivation.

---

**Do you have specific concerns about values for a crop you are growing now?**  
Tell me what kind of plant you are growing and what system you are using-we can build together an EC/pH reference chart tailored to your case.

Thank you for reading this article. Keep following us to discover new content on hydroponics, vertical farming, and smart agriculture.  
Tomato+ Team

[ Explore all articles ](https://tomatoplus.com/en/blog)

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