FAQs

Questions about hydroponics? You are not alone.

  • Our Pro Feedchart Usage Guide explains how to interpret and use General Hydroponics Pro Feedcharts. It is intended as a companion piece to General Hydroponics Pro feedcharts for FloraPro, Flora Series, Cocotek and Maxi Series.

    Basics
  • Each set of feed charts illustrates Aggressive, Medium, and Light Feeding recipes.  (For most modern production systems, we recommend the Medium Feed strength).

    Aggressive Feed: Best for larger, multi-topped plants, where planting density is low and crops are irrigated less frequently.  Plant density 0.25-4 per 16 sq ft

    Medium Feed: Suitable for most modern production systems. Best for medium-sized plants and medium planting density, where crops are irrigated frequently. Plant density 4 -10 per 16 sq ft

    Light Feed: Best for smaller plants, grown in high-density layouts and using pulse feed or very high frequency, low-volume irrigation events.  Plant density 11- 20 per 16 sq ft

    Basics
  • Each feed chart download includes two versions — Weekly & Growth Phase — and you can choose either version based on your needs.  

    Weekly Feed Chart: The weekly version divides each fertilizer recipe by week from the Seedling/Cuttings stage through Harvest. 

    Growth Phase Feed Chart: The Growth Stage versions include fewer recipes geared toward key growth stages, and are intended for large-scale commercial operators who require simplified fertilizer recipe counts for complex fertigation systems.

    Basics
  • Basic: Our basic programs use only the base nutrients in Flora Series: FloraGro®, FloraBloom®, and FloraMicro®. This program is perfect for growers who want to keep it simple, whether they are a large commercial grower trying to simplify their operation, or a first time hobbyist just trying to get their bearings.  

    Pro Performance: The Pro Performance Series feed charts include six total products: the three base nutrients in FloraSeries®, plus three additional liquid fertilizers supplements: CaliMAGic™, Liquid Koolbloom®, Floralicious® Plus.  

    • CALiMAGic™ is a concentrated blend of readily available calcium and magnesium, assists fast growing plants by preventing secondary nutrient deficiencies. 
    • Liquid Koolbloom® is formulated to provide a boost to the nutrients necessary for maximum floral yields. 
    • Floralicious® Plus contains essential plant nutrients that are known to encourage essential oil production and improve plant vigor. 

    Custom Performance: Our custom performance plan includes ten total products: the six products in the Pro Performance charts, plus four additional supplements — used individually or together — to fine tune your recipe to address any remaining challenges with your plants and their growing environment.  

    • ArmorSi™ adds Silica to strengthen and help protect plants from stressful conditions.
    • Rapidstart™ is a proprietary blend of plant nutrients to promote superior root growth and development.  
    • Ripen® contains essential plant nutrients needed for flower maturation to support abundant flowering, with greater oil and fragrance production,
    • FloraKleen® helps flush out accumulated salts from the rootzone.
    Basics
  • Yes, all of our plastic parts are food grade safe. No chemicals will leach into growing plants. The plastics are also UV stable under artificial lighting and natural lighting.

    Systems
  • Fast growing crops consume large amounts of nutrients and water so it is important to keep an eye on the reservoir every couple of days. Also consider the size of the plants(bigger plants, more water consumption) and how warm and dry the environment.(hotter, more transpiration).

    Nutrients
  • Absolutely! All of our nutrient blends contain the necessary elements for plant growth. Start with the formula ratios identified on the label for the specific plant or crop you are growing, and then adjust and experiment until you find the right formula for your specific need.

    For further information, refer to our Drain to Waste feed charts.

    Nutrients
  • Of course. Make sure you use a weaker nutrient solution than you would for root feeding. Avoid foliar feeding in the heat of the day and under excessive sunlight. Generally, the best times to foliar feed are in the early morning and late afternoon. Make sure you spray the undersides of the leaves. This is where the stomata or “lungs of the plant” are located, and where maximum absorption occurs.

    Nutrients
  • All systems can be left off at night once the plant roots are long enough to reach the nutrient level in the reservoir. Longer cycles depend on the type of system you have:

    AeroFlo systems

    The cycle can be set to run continuously during the day and coming on once or twice during the night on 15 to 30 minute intervals.

    EuroGrower systems

    Set the timer to come on for .5 hour/ off 1.5 hour during the daylight cycle once the plant has a good root system. These systems use coco peat which holds moisture and nutrients in the root zone.

    WaterFarm, PowerGrower and EcoGrower systems

    Set the timer to come on for 1 hour/ off 1 hour during the daylight cycle.

    RainForest systems

    These units are run continuously, especially if you are trying to root cuttings. If you are growing plants, they can be shut off in the evening once the roots have grown into the nutrient solution.

    All of our systems can be run 24 hours a day 7 days a week for optimal results, power conservation is the only reason to cycle watering.

    Systems
  • In hydroponics, the plant roots are constantly provided with all the water, oxygen and nutrients they need. The challenge for the grower is to keep up with the plants needs, and to avoid damaging it with either excesses or deficiencies of minerals. As a general rule, a plant consumes more nitrogen during the formative or vegetative stage, and more phosphorus, potassium and magnesium as it flowers.

    Throughout its growth cycle, the plant will also consume calcium, sulfur and micro nutrients such as iron, manganese, boron, molybdenum and copper.

    FloraMicro, the foundation or “building block” of the Flora Series system, provides nitrogen and calcium as well as trace minerals, which are essential for a comprehensive hydroponic plant diet. By adding FloraGro to FloraMicro, the plant will receive additional nitrogen and potassium, which stimulates structural and foliar growth. To stimulate flower and fruit development, FloraBloom is added to provide the necessary phosphorus, potassium, magnesium and sulfur.

    Nutrients
  • pH is a measure of the hydronium ion H3O+. It is based on a logarithmic scale from 0 to 14. “Pure” water has a pH of 7.0. If the pH is less than 7, the solution is acid. If the pH is greater than 7 it is alkaline. Because the scale is logarithmic and not linear, a pH of 6 indicates ten times more H protons than a pH of 7, and a pH of 5 indicates 10 times more protons than a pH of 6.

    pH Dyanmics
  • The General Hydroponics’ CocoTek Mats were designed for this purpose. The CocoTek mats can be cut to fit any application and come in two sizes, 4’x8’x1/4″ or 4’x4’x1″.

    Systems
  • General Hydroponic’s CocoTek Mats were designed to do just that. CocoTek Mats also create a unique air and moisture balance around the net cup. The CocoTek Mats come in two sizes, 4’x8’x1/4″ or 4’x4’x1″, that can be cut to fit any application.

    Growing Media
  • No, Dry KoolBloom works on the premise that the plant is shocked into mass flowering. Shocking the plant too much can cause rotting, bloom loss and in extreme cases plant death.

    Nutrients
  • Yes. The reservoir should be drained and rinsed every 7-14 days, depending upon plant size and nutrient usage. It should definitely be drained and cleaned whenever you change the nutrient ratio formula. It is also a good idea to rinse off the growing medium (expanded clay pebbles, CocoTek Coir) each time the reservoir is cleaned. Plant waste will tend to accumulate on the growing medium.

    Nutrients
  • No. The Vortex sprayer, included in the RainForest 66, 318 and 236, supplies an ultra fine mist of water, oxygen and nutrient in just the right amount for cuttings to survive until roots form. As with the Vortex sprayer, the pumping set up used in the RainForest 36 will also supply the right amount of water, oxygen and nutrient for cuttings to survive until roots form, no humidome is needed.

    Systems
  • For optimal results soak Rapid Rooter plugs in pure water with a light blooming formula (200ppm or 0.4mS), then place back in tray and follow procedure for cuttings or seeds.

    Growing Media
  • Do not water Rapid Rooter plugs unless they are drying out. The plugs are designed to hold the proper amount of moisture and oxygen that is optimal for starting seeds and rooting cuttings.

    Growing Media
  • Yes and no. The FloraNova series is designed to use one part at a time, but in a time of transition it may be beneficial to mix the two at half strength each (makes a full strength nutrient solution). Use FloraNova Grow in the vegetative stage and FloraNova Bloom in the fruiting/flowering stage.

    Note: If your plant is not fruiting or flowering plant, FloraNova Grow is all that you will need to use.

    For further information, refer to our FloraNova feed chart.

    Nutrients
  • Yes and no. The Maxi Series is designed to use one part at a time, but in a time of transition it may be beneficial to mix the two at half strength each (makes a full strength nutrient solution). Use MaxiGro in the vegetative stage and MaxiBloom in the fruiting/flowering stage.

    Note: If your plant is not a fruiting or flowering plant, MaxiGro is all that you will need to use.

    For further information, refer to our Maxi Series feed chart.

    Nutrients
  • They can. Rinse the growing media (especially important when using rockwool) before using it. We suggest you check the nutrient solution pH and ppm(see above) and adjust the solution accordingly.

    Growing Media
  • One brick expands to approximately two and a half gallons.

    Growing Media
  • To obtain an approximate sodium chloride TDS value, multiply the EC reading (in milliSiemens/cm) by 1000 and divide by 2.

    To get an EC value, multiply the ppm reading by 2 and divide by 1000.

    Thus, if your EC is 1:
    1 * 1000/2= 500 ppm.

    And if your ppm is 500:
    500 * 2/1000= 1 EC

    TDS, EC, PPM, etc
  • The best method is prevention. If you keep the solution away from light, i.e. keep the lids closed and all openings sealed, you can prevent algae from growing. If you already have algae in the system you can remove it with a brush, or use hydrogen peroxide (3ml of 3% H2O2 per gallon of solution) to remove it. If there are particles floating in the nutrient solution, be sure to flush the reservoir and growing chamber with ample water, and then start with a new batch of nutrient. If the problem is severe, make sure you have the algae completely flushed out to avoid the risk of clogging some of the flow lines in the system.

    Systems