ec or tds meter
meter calibration solution
optional plant flush
optional water chiller
optional aquarium heater
optional reverse osmosis filter
*** nutrients A good choice for a 1 part hydroponic marijuana nutrient is maxigro and maxibloom. They are in powder form, you add water, so that you are not paying for shipping a large container that is mostly water.
Maxigro can be used by itself as a 1 part nutrient for germinating, clones, seedlings, vegetative growth. Maxibloom can be used by itself as a 1 part nutrient for flowering.
Maxigro and maxibloom are employed by myself, and more experienced gardeners, but they will be especially appreciated by novices who want a nutrient that is easy as possible to work with.
3 part nutrient systems are used in all stages of life, but the amount of each particular part is varied depending on the stage.
For people who want more control over the relative amounts of the various nutrients being supplied to their plants, multiple-part nutrients are the way to go.
The flora series (floragro, florabloom, and floramicro) are a good example of a 3 part nutrient system for hydroponic marijuana growers.
There are other brands of hydroponic nutrients that will also provide good results like those stated above. You may want to try various brands to see what works best for you setup.
If you have a multi-part nutrient, you can vary the ratio of each part, but keep the total strength of the nutrient solution within the levels stated, in the nutrient strength section on this page.
For a hydroponic system, only get nutrients specifically intended for hydroponic applications. They have a balanced primary, secondary, trace element formula that even most soil growers will like.
*** ec or tds meter An inexpensive meter like this functions very well and makes measuring nutrients solution strength easy. It can display both EC and TDS levels.
The EC levels on this meter are displayed in µS/cm, and TDS is calibrated to NaCl standards. It also measures the temperature of the nutrient solution, or other liquids, in degrees F or C.
Calibrating this particular meter is a bit difficult without instructions because of the location of the calibration set screw. A step by step guide can be found here.
*** meter calibration solution EC and TDS meters are calibrated prior to leaving the factory, but will drift with use and need to be calibrated regularly, every 6-12 months or so.
Calibrating EC and TDS meters doesn't have to be performed as often as with pH meters, which should be calibrated every week or two.
For EC and TDS meters that will be measuring hydroponic nutrient solution, calibration solution like this is recommended. It can be used to calibrate either EC or TDS meters.
*** optional plant flush There are products to help flush nutrients from hydroponic, soil, soilless marijuana plants at a quicker rate than they would naturally.
Clearex has been used for flushing hydroponic plants, starting 3 days prior to harvest rather than 7 days prior, with good results. This gives the plants a few more days to grow.
In addition to flushing just before harvesting, most plant flushing products can be employed earlier in the life of the plant if you think too much nutrient has built up.
*** optional water chiller A water chiller will lower the temperature of water or nutrients solution, if it becomes necessary to do so.
A 1/10 hp water chiller is good for chilling a reservoir that has a capacity of up to about 25-50 gallons of water or nutrient solution.
For larger reservoirs or to cool the water or nutrients solution more quickly, a water chiller model with a larger hp rating is required.
*** optional aquarium heater A submersible aquarium heater will help raise the temperature of water or nutrient solution for a hydroponic system when it gets too cool.
A rough idea of the wattage that the heater should be is 5-10 watts per gallon of water or nutrient solution the reservoir holds. The higher the wattage, the more quickly it will raise the temperature.
*** optional reverse osmosis filter A reverse osmosis system to filter water is a good idea for providing clean water, that is ideal for hydroponic applications.
There are fairly inexpensive models, considering how important water is to hydroponics, that do a very good job and do not cost much to operate and maintain.
If you have a basic knowledge of plumbing they are easy to install. If not a plumber should be able to hook one up for you, in an hour or so.
Part 01) See the full hydroponic marijuana nutrient article here.
Part 02) Nutrients and hydroponic marijuana introduction here.
Part 03) Water and hydroponic nutrients here.
Part 04) Preparing hydroponic nutrients here.
Part 05) Measuring hydroponic nutrient solution - EC, TDS, PPM here.
Part 06) Hydroponic nutrient strength here.
Part 07) Hydroponic nutrient solution temperature here.
Part 08) Flushing or leeching hydroponic nutrient here.
Part 09) Amount of water for hydroponic marijuana plants here.
Part 10) Hydroponic nutrient list of materials here.