Hydroponics FAQ

Welcome to the BGHydro Official Hydroponics FAQ section. Use the links or search box below to find your way around.

Is a Reverse Osmosis system necessary?

See What is RO water?

What is RO water?

RO water, or reverse osmosis water, is tap water that undergone a process to strip all the impurities out of the water. Most city drinking water contains high sodium (Na), boron (B) and fluoride (F) levels. These impurities, at high enough concentrations, can be extremely toxic to plants. These elements may also reduce the uptake of other nutrients and thus cause slight deficiencies that may not be visible. RO machines also remove important plant nutrients from the tap water, such as calcium and magnesium. This is why BGH recommends using Cal-Mag Plus when using RO water. The process of removing these impurities allows the grower to start with almost pure water (the RO process removes over 98% of the total dissolved solids). The grower may now add exactly what the plants require without pushing the ppms too high. Plants grown with RO water, especially in a hydroponic system, will grow faster, yield more and exhibit fewer nutrient disorders then plants grown with tap water.

Can you recommend a good insect control program?

Seedlings/rooted clones

Once the seedling has produced its second set of true leaves, or once clones have an established root system, then the young plants should be treated with Bayer Tree and Shrub at a rate of to teaspoon per gallon of water. This is to be watered onto the plants. This will provide coverage for the plant for about 60 days against whiteflies and aphids. It has also been known to kill larvae in the growing medium. This chemical can be used at any time during the vegetative stage of a crop; however, this product should not be used in the flowering stage of a crop due to its long residual effect in the plant.

Vegetative and flowering

After the initial dose of Bayer Tree and Shrub, weekly spraying of Neem oil and Pest Out should be applied to the crop. Both of these products are organic and can be applied up to the day of harvest. Neem oil doesnt kill insects; however, it stops insects from maturing into breeding adults, thus breaking the breeding cycle and lowering infestations. Pest Out kills softer bodied insects and young mites; this product also is an insect repellent.

If an infestation breaks out and immediate control is required then Pyrethrum foggers should be used. These foggers can be used on a weekly rotation until the pest problem is brought under control. These foggers should also be used to sanitize the grow room once a crop has been taken out.

What is the proper pH level (range) for plants?

See What is pH, and how can I test for it?

What book would you recommend for a beginning grower, an intermediate grower and an advanced grower?


Gardening Indoors by George van Patten This book contains everything a grower needs to know about indoor hydroponic growing. It is detailed and easy to read. Every grower should have a copy of this book from beginners to experts.
Integral Hydroponics by G. Low This book takes the grower through the basics of hydroponics from different hydroponic systems, feeding plants, a 40+ day grow calendar to pest control.


Secrets of High-Yield Plant Growth by Graham Reinders This book is for the seasoned grower, and will help the grower to reach the maximum production from their garden.
Gardening Indoors by George van Patten See note above.


Hydroponic Food Production by Howard Resh This book is for the serious commercial hydroponic grower.
Gardening Indoors by George van Patten See note above.

What kind of pesticides can you use during flowering?

This answer is coming soon, thank you for your patience.

When and how do you use flushing agents?

This answer is coming soon, thank you for your patience.

Are algae harmful to plants?

This answer is coming soon, thank you for your patience.

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