Rockwool is produced by a process similar to making cotton candy: a particular mixture of sand and rock is melted and then turned into fibers by spinning the mixture to form products of multiple shapes and dimensions, from 1″ starter cubes and up to large slabs of  3″x12″x36″ in size. The variety of available forms and sizes turns rockwool into one of the most widely-used growing mediums.

Key advantages, as well as disadvantages, of this popular growing medium are listed below.

Rockwool’s Strong Points

HOLDING WATeR – rockwool as a growing medium in hydroponics systems is capable of holding a large amount of water. This creates an additional protection for situations, when water is not supplied because of power outages or failures in pumping or other gardening equipment.

ACCUMULATING AIR – up to 18 % of air are constantly kept by rockwool. Due to this capability, there is a very little risk to over water rockwool; besides, the plants are always supplied with enough amount of oxygen.

MULTIPLE SHAPES AND SIZES AVAILABLE – whether it is a small 1″ cube for seeds propagation or a large 3×12x36 inches slab for huge plant, rockwool offers a wide variety of shapes and sizes to choose from. Besides, loose rockwool is also available, designed for filling different plant containers.

NO DUST AND EASY TO USE – since rockwool maintains its form almost perfectly, it cannot be scattered accidentally. Besides, usually packed into plastic rockwool is a very clean material that is easy and comfortable to work with.

Rockwool’s Weak Points

NOT A “GREEN” MATERIAL – rockwool is claimed to be not environment-friendly material, because of its almost indefinite time of breakdown.

HEALTH HAZARDS – rockwool particles and fibers pose serious health danger, especially for human lungs. That is why it is necessary to wear a protective dust mask, while working with rockwoll.

pH PROBLEMS – because of rockwool’s high pH level, it is necessary to balance pH level in the nutrient solution properly and make it suitable for the plants, you are growing. In general, the use of rockwool requires more routine work to keep pH level of your nutrient solution at steady level.

LONG PRE-SOAK PERIOD – before rockwool can be used in the hydroponic system, it should be soaked for at least 24 hours beforehand. Other growing media usually do not require pre-soaking, it is enough just to well-water them.

Along with water, hydroponics plant nutrients, CO2 and oxygen, grow lights is the key basic component, required by plants to live. Providing additional light is necessary for indoor gardening. Furthermore, light should resemble the sunlight as much as possible. The major concern with other types of lights is that they do not produce light in the appropriate spectrum, required by plants.

Being the most efficient bulbs, HPS bulbs are commonly used by gardeners. Producing light in red and yellow spectrum, light generated by high pressure sodium lamps resembles the natural sunlight during autumn. Due to this peculiarity, HPS light is the best for promoting plants blooming. However, some plants may react negatively to this type of light, growing with oblong stem, etc. To address that issue, new HPS bulbs with color correction have been developed. For example, Son Argo feature properly balanced light spectrum, which suits perfectly for the needs of indoor gardening.

High pressure sodium grow lamps are made of a semi-transparent ceramic arc tube, filled with a mixture of sodium, mercury, and xenon. The arc tube is placed into the protective outer glass shield, similarly to metal halide bulbs. The power ranges of HPS bulbs vary from 35w to 1000w, while the most popular are 250w, 400w, 600w and 1000w.

HPS bulbs are more durable in comparison with MH bulbs: they can be replaced once every 24 months. Though HPS grow lights lose their brightness slowly, in order to keep the brightness at the steady level, it is still recommended to replace the bulb within the specified period.

Among the brand new types of grow lights are sulfur lights, which are said to feature extremely high brightness and effectiveness. However, these bulbs are still rare on the market in view of the high price, so it is early to evaluate their practical value for those gardeners, for whom indoor hydroponics growing remains a hobby.

Different Types of Growing Mediums

Although almost any substances can more or less serve as the growing medium, the most popular are those named below:

- Water / Air / Sand / Gravel

- Vermiculite / Perlite

 - Lava Rock

 - Sphagum Moss / Sawdust

 - Expanded clay pellets

 - Oasis Cubes

 - Coconut Fiber

 - Fiberglass Insulation

 - Proprietary Soilless Mix

 - Rockwool

Although rockwool is the last in the list, it can definitely be named the most popular growing medium among hydroponics gardeners, because it is easy and cozy to use.

Rockwool was initially used as insulation material in building. However, hydroponic gardeners in Denmark were the first to discover its advantages when used as a growing medium. Nowadays, rockwool is highly valued and commercially available in the forms of rockwool cubes and rockwool plugs. To produce rockwool stone and sand are melted together and then spun into various shapes and sizes, which sounds similar to the production of cotton candy.

Rockwool Advantages

Rockwool cubes (sized 36” by 12” by 3”) are very convenient to use, because they can be easily cut to a shape matching your needs. This material perfectly holds water and air, being very porous. Therefore, the roots of the plants will be protected both from rotting and drying out in case of the pump malfunction or other event long enough for you to be able to correct the situation.

The granules of the rockwool plugs keep together well and are not less easy to use.

Precautions

Unfortunately, rockwool has weakpoints as well, besides the benefits mentioned above. It can hardly be called environmentally friendly, as it is made of rock and thus does not bio-degrade, requiring some efforts to eliminate it. Moreover, it can be dangerous for the human health, causing silicosis if accidentally inhaled. For this reason, it is recommended to wear a face mask with a HEPA filter and handle rockwool carefully. 

One more thing, a gardener should keep in mind while using rockwool, is that this material has a very high pH level, which should be reduced with available acidic substances and regularly checked.

In spite of the rockwool cons, it is still so easy and comfortable to use that it remains the most popular growing medium type among the hydroponics gardeners. The only thing to do is to take necessary precautions while working with it.

Metal halide lamps contain aluminum arc tube, filled with argon, mercury and a variety of specific metals. It is a set of different metals that provide a particular color of the light, produced by the lamp. The argon gas works to start a lamp, when electric current is introduced at the electrodes on either end inside the arc tube. Under the effect of electric current mercury and metals start to vaporize and the light is produced. The key benefit of these lamps is that being small in size they produce a significant amount of light.

HPS grow lights, also known as high-pressure sodium lights, also have an aluminum arc tube inside, similarly to metal halide lights. However, the filling of the tubes is different: in case of HPS there are sodium, mercury, and the Xenon gas inside. Both metal halide lights and HPS lights require ballast for stabilizing electric current and providing smooth performance.

LED grow lights are small, but work very efficiently providing a lot of bright light. In general, they are similar to the lights, used for decorating Christmas tree. The light is produced when electric current moves between the two crystals inside a diode, which works as semi-conductor. Furthermore, LED grow lights usually have a reflector and a lens to direct the light where it is needed.

 Along with being cost effective and energy saving, there are multiple different color spectrums to choose among in order to suit specific plants needs in the best way. So, irrespectively to what type of grow light you choose, it will work accurately and provide effective growth of your indoor plants.  

Metal halide lamps contain aluminum arc tube, filled with argon, mercury and a variety of specific metals. It is a set of different metals that provide a particular color of the light, produced by the lamp. The argon gas works to start a lamp, when electric current is introduced at the electrodes on either end inside the arc tube. Under the effect of electric current mercury and metals start to vaporize and the light is produced. The key benefit of these lamps is that being small in size they produce a significant amount of light.

HPS grow lights, also known as high-pressure sodium lights, also have an aluminum arc tube inside, similarly to metal halide lights. However, the filling of the tubes is different: in case of HPS there are sodium, mercury, and the Xenon gas inside. Both metal halide lights and HPS lights require ballast for stabilizing electric current and providing smooth performance.

LED grow lights are small, but work very efficiently providing a lot of bright light. In general, they are similar to the lights, used for decorating Christmas tree. The light is produced when electric current moves between the two crystals inside a diode, which works as semi-conductor. Furthermore, LED grow lights usually have a reflector and a lens to direct the light where it is needed.

 Along with being cost effective and energy saving, there are multiple different color spectrums to choose among in order to suit specific plants needs in the best way. So, irrespectively to what type of grow light you choose, it will work accurately and provide effective growth of your indoor plants.  

 Light and Photosynthesis

 Essential sugars are created by plants through photosynthesis which is the process of converting carbon dioxide, water and nutrients into energy. Light is considered the most important factor because it provides energy for this chemical reaction. Studies show that an increase in light intensity directly increases the amount of sugar produced. This steadily goes up till the saturation point for light is reached by the plant. Increasing the level of light received by the plant should also be considered. Normally, a plant receives around 8-12 hours of sunlight in a day depending on the season. Plant exposure to this amount of light received in a day should be maintained in an indoor hydroponic garden system. Spacing is also important, be sure that they don’t block the light and ensure all plants received equal amount of light.

Plants not receiving enough grow light will have lasting negative effects on its growth even when corrected. Some characteristics are stems which are spindly and elongated leaving them ineffective in supporting plant growth. A decrease in the amount and size of the leaves is also one problem. More damaging effects of improper lighting are a decrease or absence of fruits, decreased overall quality and a change into a yellowish pigmentation for the plant.

Carbon Dioxide also plays a major role in Photosynthesis. Plants utilize the CO2 present in the atmosphere than anything else. CO2 systems are available which increase the levels of CO2 in your indoor hydroponic garden system

Good ventilation should also be considered as they maintain temperature and a steady fresh supply of CO2 and oxygen at all times. Complex setups require more complicated ventilation systems but an oscillating fan set on the same timer as the lights would ensure airflow that eventually allows for optimal plant nutrients in an hydroponic system.

Building Ebb and Flow Hydroponic System

The following hydroponic supplies are required for an Ebb and Flow hydroponic system

Growing Tray

Root protection requires a growing light that shields your roots from light. Plastics are preferred to metals and wood due to its light weight and durability. A thorough check of the growing medium is required to make sure that water drainage is complete. Root rot, pests problems and molds are the main problems encountered by improper drainage.

Plant Pots

Any non-metallic plant pot with drainage holes will suffice for a simple ebb and flow system.

Growing Medium

Ebb and flow systems need no special type of growing medium. Clay pebbles (sometimes called grow rocks) are usually used, they don’t need to be mixed with other mediums. Due to frequent flooding cycles, it is advised that water retention be avoided.

Supports

Support for the tray suspended above the reservoir is needed. The setup of the indoor system would dictate if a simple table or milk tray, or a customized support is required. Something sturdy is what you need for supporting the full weight of your setup. Always include the weight of the water and nutrients in planning. Taking note the mature size and weight of the plants should also be considered. Changing the supports would present an impossible if not very difficult scenario once the plants reach their full growth size.

Reservoir

Any large plastic can be used as a reservoir (rubber tubs and trash cans are also ideal). Rust is the main problem with metal containers.

Drains

Two drains are required for your garden, a drain for the water to return to the reservoir and one for the overflow drain. Fill pipes also serve as a drain pipe, allowing it to run up the same way it came down. Overflow pipes should be designed at the desired maximum level of water for the indoor hydroponic garden system. Be sure that the overflow pipe is large enough to accommodate the amount of water to be pumped out of your grow space. Ideally a figure of 125% to 135% of the amount is desired. This assures a optimum flow of nutrients for the growing medium and avoids salt and mineral to buildup.

Water Pump

Pump size depends on the indoor hydroponic systems needs. The amount of water and distance are factors to be considered for the size of the pumps. Aquarium pumps can be used for most small scale systems.

Timers

The type and cost of timers depends on the specific setup of your gardens need. Hobbyists usually employing a single time schedule can work with a cheap timer readily available at a Home Depot or Lowe’s type store. Larger more sophisticated timers are needed for advance or large scale ebb and flow systems this allows control for more than one section at a time.

Flexible Plastic Tubing

Transparent flexible tubing’s should be avoided to prevent algae build up. Ordinary flexible tubing’s may also be used. 

Care of Ebb and Flow Hydroponic Systems or reservoir systems are one of the easiest to build and maintain. Simplicity and low cost in setting up make it ideal for home hobbyists. Basic setup consists of a growing tray for plants in containers. Usually used with pebbles, perlite and rockwool gardening mediums. Reservoirs filled with water and hydroponic nutrient solutions are placed under the growing medium. A timer controls the amount of water pumped back into the growing tray. The draining action helps provide a steady flow of oxygen to the plants roots. An overflow drain is installed to regulate water height and avoid overflow.

The technique of the organic hydroponics allows supplying organic nutrients to the upper soil-mixture layer, as in traditional plants growing. The liquid forms of the organic nutrients are mixed according to the necessary concentration and then poured onto the top of the medium upper half.  Beware, though, of pouring too many nutrients!

This experiment will help you learn how much liquid with hydroponics nutrients you should pour on your plants for its excess not to drip into the lava rock layer and, consequently, into the water reservoir. If you find out that there is an excess of feeding liquid and it drips through the lava rocks into the grow bed, you can either soak it up with a cloth, or you can use other form of fertilizer, the one without liquid. It is also reasonably to change lava rock.

However, if only a small amount of organic nutrients is noticed to drain into the reservoir, there will be no problem, as the volume of water there is much larger. Reservoir water should be changed every 1-2 weeks, similarly to the standard hydroponics nutrients chemical reservoirs

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What is the function of soil in our yards and gardens? Simply put, soil provides plants with mineral nutrients, water and anchorage. The basic types of soil are clay, sand, and silt. The percentage of each determines whether you have sandy clay loam, silt, loam, etc.  There are so many variables that affect soil that your yard may have a different soil type than the one across the street.

Some soil properties that are influenced by the texture of soil include aeration, drainage, water holding capacity and temperature. For example, sandy soil has excellent aeration, warms quickly in spring and has a low water-holding capacity. The exact opposite is true for clay. It has poor aeration, warms slowly, and has high water-holding capacity.

Here are the four major components of soil:

The solid portion, or rocks and minerals Decaying organic matter, microorganisms, living or dead plants and other organic matter Liquid Soil air

Amounts of each of these components determine whether or not plants will grow and thrive in the soil. Ideal or perfect soil consists of 25% air, 25% water, 40% mineral matter and 10% organic matter. As you already know, this never happens!

However, what we do to improve our soil will affect our plants.

You can re-mineralize your soil by adding Minerals Plus or Texas Greensand. You can increase organic matter by adding a good organic compost. This also increases earthworm activity and beneficial bacterial growth.  Spray-N-Grow increases microbial activity that helps keep air and water moving in the soil. To find out more about your soil, use the Sunleaves Three Way Meter.  It allows you to test your soil for pH, nitrogen, phosphorus and potassium and will give you immediate results.

Naturally, some soil needs more work than others, but with a little work and some good organic garden products, you can pretend that your soil is perfect! All of the gardening products listed in this article can be purchased from Spray-N-Grow.