Reverse osmosis units

Reverse osmosis uses the semi-permeability of a selective membrane during water filtration, together with higher pressure on the side of the more concentrated solution. Only the solvent (water) therefore passes through the membrane, while the membrane retains mineral salts and other substances dissolved in the water. In growing processes, this principle ultimately ensures optimal fertiliser efficiency, because the filtered incoming “hard" water is stripped of unwanted substances whose presence would normally increase EC values.

• What water do you water your plants with?
• Maintenance of hydroponic systems

The specialist in reverse osmosis is undoubtedly Growmax Water.

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Modern reverse osmosis units from this brand can easily handle not only hard water, but also reliably remove all other organic and chemical impurities, whether it has been contaminated by various bacteria or chemical substances such as pesticides, insecticides or herbicides. Activated carbon filters absorb, among other things, 99 % of chlorine molecules, which are a common part of tap drinking water (the range) and are life-threatening to plants.

For perfectly clean water, use osmosis units with the ability of total deionisation such as Growmax Water Power Gro. This device can filter an impressive 500 litres in a single day without the need for electricity!

Which output to choose

The units differ in daily capacity. For a smaller grow room, the compact MiniMax 75 with an output of around 240 litres per day is enough, medium-scale operation is covered by the range around 500 to 1000 litres (Powergrow, Maxquarium, MegaGrow), and demanding commercial growers are served by units with a capacity of 2500 litres per day. An alternative to Growmax is Aquili Classic with an output of 379 litres per day, also suitable for aquatics.

Frequently asked questions

Why does a grower need osmosis water?

Osmosis water has an EC value close to zero, so you have full control over how many nutrients you supply to the plants. There is no risk that hard water will add unwanted salts and that fertilising will no longer match what you have mixed.

Does reverse osmosis need electricity?

No, Growmax Water units work on mains water pressure without being connected to the power supply. If the pressure is low, an additional pump can be added to increase the pressure to the required approximately 4 bar.

How often are the filters and membrane changed?

The sediment and carbon filter are changed according to the quality of the incoming water, usually once a season; the membrane lasts longer. Clogged filters reduce both flow and water quality, so it is good to keep an eye on them and have a spare set ready.

How much waste water does osmosis produce?

Part of the incoming water leaves as a concentrate with flushed-out salts - that is the principle of the technology. The ratio depends on pressure and the condition of the membrane; you can use the waste water, for example, to water outdoor, less demanding plants.