By Steven Voser


Relative humidity is an extremely important variable in cannabis cultivation, and it's something even first-time growers need to wrap their heads around in order to produce a decent harvest. Because cannabis plants like warm temperatures (and warm air holds more moisture than cold air), you’ll want to measure and control the humidity in your grow room in order to create the perfect environment for your plants.

In this article, we’ll walk you through how to control the relative humidity in your cannabis grow room using a dehumidifier.

What Is a Dehumidifier?

As their name suggests, dehumidifiers are appliances designed to reduce the humidity in a particular area. Many people use dehumidifiers to control the humidity in their homes for comfort, as well as to prevent the growth of mould and mildew (which thrive in humid conditions). However, dehumidifiers also have commercial and industrial applications, such as reducing the humidity in indoor swimming pools, gyms, ice rinks, storage warehouses, and more.

How Does a Dehumidifier Work?

There are two main types of dehumidifier on the market:

  • Refrigeration dehumidifiers: These work by drawing in air from the environment over a refrigerated coil. The water present in the air condenses on the coil and then drips into a collection tray or bucket where it can be disposed of or recycled.
How Does a Dehumidifier Work?
  • Desiccant dehumidifiers: These dehumidifiers draw ambient air through a wheel covered with desiccant (a water-absorbing substance such as silica gel). Instead of dripping into a tray, the water absorbed by an adsorption dehumidifier is removed during the regeneration phase by evaporating the moisture from the desiccant with a stream of warm air. This now-moist air then condenses on a metal plate, from where the water drips into a collection tank.
How Does a Dehumidifier Work?

How To Choose the Right Dehumidifier for Growing Cannabis

Whether you’re an experienced grower or just getting started, you’ll likely need a dehumidifier to control the humidity in your grow space. Below, we’ll outline some of the main things you’ll want to keep in mind when choosing a dehumidifier for your indoor grow room.

  • Your Budget

Your budget is going to have a big impact on the kind of dehumidifier you choose to use. Unfortunately, not using a dehumidifier more often than not results in mould or pest issues that have the potential to ruin your entire crop. So, make sure to consider the costs of both buying and running a dehumidifier early on, and budget accordingly. This is one of those pieces of equipment you simply don’t want to skimp on.

  • Portable vs Fixed Humidifiers

Portable dehumidifiers collect water in a reservoir tray that needs to be emptied regularly. Fixed dehumidifiers, on the other hand, use drainage pipes to run the collected water into a drain or larger container (where it can be reused).

Both portable and fixed dehumidifiers have their pros and cons; portable models, for example, have the advantage of, you guessed it, being portable, meaning you can easily move them around your grow room or transport them into a new grow space (should you move, for example).

Fixed dehumidifiers, on the other hand, have the benefit of being less hands-on, as they automatically drain the water they’ve collected from the environment. However, they are more complicated to set up, which usually makes them suitable only for large, permanent grow rooms.

  • Reservoir Volume

This is another important aspect to consider when choosing a dehumidifier for your cannabis grow room. Dehumidifiers with large reservoirs obviously need to be emptied less frequently, but they also typically take up more space and are more expensive.

If you’re growing in a small room/tent, you may need to make the sacrifice of using a small dehumidifier and emptying it more frequently to avoid limiting your grow space even further. If, on the other hand, space and budget aren’t a big concern for you (or your grow room often goes unattended for long periods of time), you may want to opt for a dehumidifier with a large reservoir.

  • Grow Room Size

Most of the dehumidifiers you’ll find on the market today are fairly efficient, meaning they’ll do a decent job of keeping the relative humidity in a small grow room or tent at optimal levels. If, however, you’re an experienced grower with a large-scale grow room, you’ll need to invest in a larger dehumidifier that can effectively dehumidify the space you’re working with.

How Does a Dehumidifier Work?

How To Make a DIY Dehumidifier for Cannabis Growing

If you’re on a tight budget, there is a way to build your own DIY humidifier. While it won’t hold up in the long run and can’t be compared to any of the commercial dehumidifiers currently on the market, it might be a viable option if you’re on a super tight budget.

Equipment

  • 2x 20l buckets
  • Large bag of rock salt
  • Drill

Directions

  1. Use your drill to make a few drainage holes in the bottom and sides of one of your buckets.
  2. Place the bucket with the holes into the one without holes.
  3. Pour the rock salt into the top bucket.
  4. Place the dehumidifier into your grow room and check on the reservoir every day.

The concept here is pretty simple; the rock salt in the top bucket will draw moisture from the air, which will condensate and drip into the reservoir bucket on the bottom. The level of humidity in your grow tent will determine how much water the dehumidifier will capture and how often you need to change the rock salt.

Remember, this homemade dehumidifier can’t compare to a domestic, let alone commercial, dehumidifier. However, it’ll at least do something to control the humidity in your grow room.

Other DIY Dehumidifier Options

The rock salt dehumidifier we mentioned above isn’t the only DIY option when it comes to managing the humidity in your grow room. Some other DIY dehumidifiers out there include:

  • Calcium chloride dehumidifier: Like rock salt or silica gel, calcium chloride is a readily available and relatively effective desiccant. Try filling a sock with calcium chloride and hanging it from a piece of string somewhere in your grow room. You can use a bucket or bowl to catch the moisture that drips from the sock.
How Does a Dehumidifier Work?
  • Silica gel: Place a silica gel dehumidifier inside a plastic container (make some holes in the container to allow air to flow in and out of it). Place the container inside your grow room, and the silica gel will automatically absorb moisture from the air.
How Does a Dehumidifier Work?
  • Coffee whitener: Pour some coffee whitener in a bowl and place the bowl inside your grow room/tent. The whitener will absorb moisture and harden over time, so you’ll need to replace it regularly.
How Does a Dehumidifier Work?
  • Moisture-absorbing crystals: Available online and at some shops, these crystals absorb moisture from the air and form a solid mass. Like with rock salt, you can pour these crystals into a bucket with holes and place that bucket inside another to act as a reservoir. You’ll need to replace the crystals once they harden.
How Does a Dehumidifier Work?

Managing humidity is key to growing healthy cannabis plants and harvesting great bud. Make sure to invest in a dehumidifier from the get-go to have complete control over the humidity in your grow room/tent, or try one of the DIY options listed above if you’re strapped for cash.

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Privacy Policy - Royal Queen Seeds

To ensure a safe online environment and guarantee adequate data protection, we strictly comply with all legal requirements. In this privacy statement, we provide information about how and for what purpose data is collected, safety measures, storage periods and contact details.


COMPANY NAME: SNORKEL SPAIN, SL (hereinafter ROYAL QUEEN SEEDS)

C/ Vilar d'Abdelà, 5 (nave 1) CP: 08170 de Montornès del Vallès

+34 937 379 846

support@royalqueenseeds.com


The present Privacy Policy sets out the terms on which we will treat personal data at ROYAL QUEEN SEEDS; this includes any personal data collected through our website https://www.royalqueenseeds.com/ as well as any other data we process in the course of our business activities.

ROYAL QUEEN SEEDS collects the following personal data for the purposes listed below:

SECTION 1 – PERSONAL INFORMATION WE COLLECT

1.1 Account purchases

Account purchases can only be made if you are in possession of a personal account. When you create an account or purchase something from our shop, as part of the buying and selling process we collect the following personal information that you provide to us:

This information is required for delivery. In addition, when you browse our shop, we automatically receive the Internet Protocol (IP) address of your computer. Based on this information, we can optimise your online experience and at the same time protect our online environment.

Purpose of data collection

We collect and store account-related data for the following purposes:

(a) to carry out obligations arising from any contracts between you and us, and to provide you with information, products and services that you may request from us;

(b) to set up, manage and communicate with you about your account and your orders;

(c) to conduct market research and analysis;

(d) to confirm your age and identity, and to detect and prevent fraud.

1.2 Newsletters

With your explicit permission, we may send you newsletters about our shop, new products and other updates. We send newsletters based on your explicit consent. In the event that you purchase a product, and in accordance with current regulations, we may send you commercial communications in accordance with the legitimate interest of our company, always about products or services similar to those you have purchased or contracted. In any case, you may exercise your right of opposition through the channels announced in this Privacy Policy. The following information is collected in relation to the newsletter:

We do not need to know the sex of the person in order to send the newsletter (data minimisation: by law we must ask for data that is strictly necessary to provide the service, and in this case knowing the sex is not necessary to send the newsletter).

Purpose of data collection

The data collected is used to:

(a) personalise our emails, including your name and gender;

(b) provide gender-specific content.

You can withdraw your consent at any time by using the link provided in the newsletter or the contact information provided in section 2.

1.3 Customer service and contact form

In order to provide appropriate support, our customer service employees have access to information related to the account. Consequently, their support will be highly effective and friendly. The data provided in our contact form is used by our CRM provider, SuperOffice. We will only use your details to respond to your message.

SECTION 2 – LEGITIMATE INTEREST

If you have purchased any of our products, please note that we may process your personal data for promotional purposes, based on Royal Queen Seeds' legitimate interest only to offer you products or services from our company and about products or services similar to those you have purchased. You may exercise your right to opt out of future messages by the means set out in this Privacy Policy or through any notification you receive.

2.1 How do you withdraw consent?

If you change your mind, you can withdraw your consent for us to contact you for the purpose of collecting, using, or disclosing your data at any time by reaching out to us at: support@royalqueenseeds.com.

SECTION 3 – DISCLOSURE

We may disclose your personal information if we are required to do so by law or if you breach our Terms of Service.

SECTION 4 – HOW LONG DO WE KEEP YOUR DATA?

At Royal Queen Seeds, we will not retain your data for longer than is necessary for the purposes described in this Policy. Different retention periods apply for different types of data; however, the longest period we will normally hold any personal data is 10 years.

4.1 Account information

Data relating to the account remains relevant for as long as the consumer is in possession of an account. Therefore, the data remains documented for as long as the account exists. When our customers delete an account, the associated data will be deleted within a reasonable period of time. Requests regarding the inspection or correction of stored personal data or the deletion of an account can be sent to support@royalqueenseeds.com.

4.2 Newsletters

In the event that you give us your consent to inform you about our products or services, we will keep your data until you express your wish not to receive any further communications from us. However, we regularly (every month) carry out a relevance check. Registered customers (and their personal information) will be deleted whenever customers do not reply to our request. In addition, our newsletter mailing has an opt-out feature. Consumers can withdraw their consent by using this opt-out feature.

SECTION 5 – COOKIES

Cookies are small information files that notify your computer of previous interactions with our website. These cookies are stored on your hard drive, not on our website. Essentially, when you use our website, your computer displays its cookies to us, informing our site that you have visited before. This allows our website to function more quickly and remember aspects related to your previous visits (such as your username), making your experience more convenient. At Royal Queen Seeds, we use two types of cookies: functional and analytical.

5.1 Functional Cookies

Functional cookies are used to enhance your online experience. Among other things, these cookies track what is added to your shopping cart. The use of these cookies does not require prior authorization.

5.2 Analytical Cookies

Analytical cookies are used for research and market analysis. The data collected with these analytical cookies is anonymous, making it unusable for third parties. The use of these cookies does not require prior authorization.

SECTION 5 – THIRD-PARTY SERVICES

Third-party services are required to conduct transactions and provide our services. In general, the third-party providers we use will only collect, use and disclose your information to the extent necessary to enable them to perform the services they provide to us.

However, certain third-party service providers, such as payment gateways and other payment transaction processors, have their own privacy policies regarding the information we must provide to them for your transactions.

We encourage you to read the privacy policies of these providers so that you can understand how these providers will handle your personal information.

In particular, certain suppliers may be located or have facilities located in a different jurisdiction than yours or ours. Therefore, if you choose to proceed with a transaction involving the services of a third party, your information may be subject to the laws of the jurisdiction in which that service provider or its facilities are located.

Once you leave our website or are redirected to a third-party website or application, you are no longer governed by this Privacy Policy or the Terms of Service of our website.

Web analytics service (anonymous data)

On this website we have integrated an element of a web analytics service (with anonymisation functionality). Web analytics can be defined as the gathering, processing and analysis of data about the behaviour of visitors to websites. An analytics service collects, among other things, data about which website a person came from (the so-called referrer), which sub-pages they visited or how often and for how long they visited a sub-page. Web analytics is mainly used for website optimisation and for a cost–benefit analysis of internet advertising.

Courier service

To complete deliveries we use a courier service. This courier service carries out the delivery between our company and the consumer's home. To complete these logistics, the company requires access to the consumer's name and address information.

Mailing service

Royal Queen Seeds uses a third-party mail service provider to send its newsletter. This provider has access to limited account information related to opt-in consent (e.g. email address).

Marketing services

Royal Queen Seeds has the support of a company that specialises in marketing and communication activities. Their access to personal information is very limited and mostly anonymous.

Payment services

At Royal Queen Seeds we use external payment services to handle our transactions (e.g. credit card payments).

SECTION 6 – SECURITY

To protect your personal information, we take reasonable precautions and follow industry standard best practices to ensure that it is not inappropriately lost, misused, accessed, disclosed, altered or destroyed.

If you provide us with your credit card information, the information is encrypted using secure socket layer technology (SSL) and stored using AES-256 encryption. Although no method of transmission over the internet or electronic storage is 100% secure, we follow all PCI-DSS requirements and implement additional industry standards that are commonly accepted. Information related to the account is protected with a hashing method. This method transforms the information into a generated hash. As a result, confidential information is protected and invisible, even to us. In addition, our databases are exceptionally protected against unauthorised access. For example, access to the database is only possible and permitted via approved IP addresses (e.g. from Royal Queen Seeds headquarters). Other attempts and addresses are rejected at all times.

Furthermore, data is anonymised as much as possible, so it cannot be directly linked to a specific consumer. With this data, however, we may be able to carry out market research and analysis. In addition, the third parties concerned (e.g. mailing service) are examined prior to our collaboration, comply with the GDPR from the EU and receive a processing agreement. Within Royal Queen Seeds, employees are assigned different access permissions. Specific permission provides access only to information that is strictly required to perform a task. Digital security measures are subject to change and must meet high requirements to ensure the safety of online customers. That is why, at Royal Queen Seeds, we appoint a security officer. Regular verification and improvement of security measures (where necessary) are part of the role.

SECTION 7 – CHANGES TO THIS PRIVACY POLICY

We reserve the right to modify this Privacy Policy at any time, so please check back regularly. Changes and clarifications will be effective immediately upon being published on the Website. If we make substantial changes to this policy, we will notify you here that it has been updated so you will know what information we collect, how we use it and under what circumstances, if any, we use and/or disclose it.

SECTION 8 – YOU HAVE THE RIGHT TO: