SonicAir Humidifier




  • Easy to use – plug and play
  • Boost growth during early vegetative period
  • Avoid stress from excessive transpiration
  • Perfect for mother tent/clone areas
  • Easily controllable output

These grow room humidifiers are a great choice for raising the Relative Humidity (RH) in a hydroponic grow room. This is always a particularly crucial time during the propagation period and when establishing young plants. In a grow room with a low RH, the young plants will transpire excessively and not be able to keep up the water supply with the small root zones they typically have. If you want to create the healthiest plant for your flowering period, humidifiers are a great choice to help you get there.


This all-in-one unit really couldn’t be much easier to use. Simply fill up the inbuilt reservoir with water, and plug it in! There is a dial on the front of the unit that allows you to control the rate at which the unit works. The reservoir has a capacity of up to 5 litres. Typically, this will last up to a day or two, depending on the rate of dosage. At full capacity, the unit can release up to 400ml of water vapour into the air. Once filled with water simply position it in your grow room where the water vapor will be most evenly distributed.

Inside the unit, there is a small ceramic disc that vibrates at an ultra-sonic rate. This produces a mist of water vapour that has an extremely fine particle size. The fine particle mist is arguably more efficient at raising the humidity levels than centrifugal based humidifiers. The ‘mist’ produced from the humidifiers must first evaporate into the environment before the relative humidity rises. A mist with a smaller particle size requires less energy to do this, as the total surface area of water is a lot greater. So, while these units may not offer the overall coverage of products like the HR units, they do offer a much greater efficacy.


In an indoor hydroponic grow tent, humidity is possibly the most important aspect of the environment and at the same time, the most overlooked one. It is responsible for controlling the amount of transpiration in a plant and without correctly compensating the environment for your plant, you will not see the high yield you should be expecting.

Particularly important in the early vegetative stages. Young plants with small root zones will struggle to cope in a low humidity. They will begin to transpire excessively, resulting in limp plants and eventually leading to wilting, leaf tip burns and all round poorly/possibly dead plants. Too high a high humidity will result in very low transpiration rates, causing issues with positive root pressure (leading to stretching) and causing to nutrient issues with elements such as calcium.

Having the relative humidity at the right levels throughout all stages of your grow will ensure a healthy balance between root pressure and transpiration, which will in turn result in optimal photosynthesis rates, nutrient uptake and an optimal cooling capacity. 99% of all the water your plant takes up goes into keeping itself cool. Typically, less than 1% is used for photosynthesis. The relative humidity levels you need throughout an entire grow vary considerably, and without adequate controls in place, your plants are in for a rough ride.


Start off by having a high relative humidity in your hydroponics grow room when your plants are young. Then lower it down as your plants get larger, but long before they start creating dense flowers. A high humidity level for younger, establishing plants is ideal to stop excessive transpiration levels. A lower humidity for older flowering plants is necessary to prevent the onset of diseases like Botrytis (grey mould) destroying your entire crop.

Throughout the growing cycle, you need to harden your plants off to a lower humidity as quickly as possible, but at the same time gradually enough to not place excessive water stress on them. As each new leaf set is produced in a growing plant, it creates a certain number of stomata that will not change as the leaf grows.  So, as each new leaf set is created, you need to gradually change the environment conditions to tell the plant to create more stomata on each successive set of leaves. More stomata per leaf means they will perform better in the demanding environment they will find themselves towards the end of the flowering cycle.


It is highly recommended to use these in conjunction with Reverse Osmosis, or de-ionised water. Not only will it improve the longevity of the units themselves, but it will also avoid any potential residues left on other equipment like carbon filters, or grow light reflectors.

While timers can be used with this unit to control humidity levels, it is recommended to use a suitable hygrostat to ensure your humidity is at exactly the right level, all the time.

Check your humidity levels at a few points throughout your grow tent or grow room. Take an average of these readings so you get a good view of exactly what is happening in your room. Make sure the probe/unit is out of direct light, around canopy level when taking readings.

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SonicAir Humidifier

SonicAir Humidifier