The fertigation room layout decides how much of every shift is spent walking, lifting and looking for things. Stock tanks, dosing pumps, filters, panels and drums of acid share one small room, and when the order is wrong the symptoms surface downstream: unexplained EC swings, a pump that cannot be isolated without stopping the house, a spill that drains wherever it happens to drain. Most of that is fixed on paper.
This article covers layout rather than mixing procedure — where the room goes, how much floor it needs, and how the equipment inside it should be arranged. It reflects retrofit work, where the plant room is usually sized last and everything is fitted around it.
What the Room Has to Do
A fertiliser room design has to satisfy four functions at once: make and store solution, deliver it at stable pressure to every zone, keep incompatible chemicals apart, and allow inspection and cleaning without dismantling the room first.
When one of those functions loses to the others, the failure looks operational: tight aisles mean the daily check gets skipped, a manifold behind a tank means nobody closes a valve they cannot see, and chemicals sharing a bund with acid mean an evacuation.
Where the Room Should Sit
Place it against the crop it serves rather than wherever space is left over. Three distances matter: distance to the crop, because long runs mean slower response and more volume to flush; distance to the delivery point, because fertiliser comes through a door and down an aisle; and distance from packing, because food-safety auditors look hard at chemicals near packed product.
Two constraints usually settle it. Drainage has to connect to a collection point under the site’s discharge arrangements rather than a convenient pipe. And the floor has to carry the load: solution weighs roughly one tonne per cubic metre, so a room full of tanks is a structural question, not a housekeeping one.
How Much Floor Area to Allocate
Build the figure up from what has to fit rather than from a percentage of greenhouse area: the footprint of every tank plus its working aisle, then space for the things people forget.
- Operating access: a clear aisle of roughly 900–1,200 mm where valves, gauges and lids are read.
- Removal route: space to pull a pump or tank out to the door without dismantling pipework first.
- Chemical storage: drums and bags off the floor, in their own bunded area with pallet access for rotation.
- Bench space: a surface for jar tests, samples and the logbook, since anything without a home ends up on a tank lid.
Headroom is the other figure that gets missed. Tank lids have to open fully, agitators come out vertically, and a hoist beam costs little in a new build and a roof penetration later.
Nutrient Tank Placement: A, B and Stock Solution
Keep concentrate tanks separated so nothing cross-contaminates or gets mistaken for something else. The rules that hold up: no hose moves between concentrates, every lid labelled on two sides, each tank with its own identified suction line and foot valve.
Nutrient tank placement should also keep concentrates away from the drain and from anything that could siphon back into them — a return line discharging near a stock tank lid, or a hose left in a fill port when a pump starts, is how a batch gets written off. Tanks sit best on a level, load-rated base inside secondary containment, with clearance behind them for inspection.
Dosing Equipment Layout: Pumps, Injection and Manifold
Dosing equipment layout wants short, labelled suction lines and a clear view of each pump. Mount injectors close to the concentrate they draw from, keep injection downstream of filtration, and bring the manifold up to a height where gauges and valve handles can be read without kneeling — roughly 900–1,400 mm from the floor is a workable band.
The manifold is also the control panel for the room. Give it one isolation valve per pump, a calibrated cylinder within arm’s reach for checking injection rate, anti-siphon protection on each suction line, and the same numbering that appears on the panel and drawings. Space beside the last pump is what lets a spare be added later.
Chemical Segregation: Acids, Sanitisers and What Cannot Share a Bund
Where chemical segregation in hydroponics breaks down most often is storage, not dosing. Acids used for pH correction belong apart from sanitisers and oxidisers: acid contacting hypochlorite releases chlorine gas, and it does not take much to clear a room. Incompatible classes need their own bund and ideally their own cupboard, not a shared shelf behind the door.
Ventilation follows from that list, along with provisions worth settling before the room is built: emergency eyewash within a few steps of where acid is decanted — many jurisdictions reference a ten-second reach and fifteen-minute flushing supply, so confirm locally — clean water for dilution, and PPE stored outside the splash zone.
Bunding, Floor Finish and Drainage
Assume liquid will end up on the floor. A corrosion-resistant finish falling toward a collection point is cheaper than replacing a slab, and keeping penetrations and cable routes out of the bunded zone avoids the classic leak path.
Bunding capacity follows local environmental rules, many of which reference either 110% of the largest vessel or 25% of the total volume held, whichever is greater — confirm which applies. Whatever the floor collects should route to a holding point rather than a storm drain; nutrient-rich discharge is a permit question, and what cannot be discharged has to be stored.
Routing, Labelling and Inspection Points
Circulation should work in one direction: deliveries in one way, solution and samples out the other, so the clean side never crosses the chemical side.
Labels should match the drawings and panel schedule exactly, using one numbering system across all three. Then define what gets checked, since inspection points keep a layout intact:
- Tank levels and whether they moved as expected overnight.
- Dampness under tanks, pumps and unions.
- Bund contents, since yesterday’s spill is a hazard in itself.
- Pump sound and seals, plus suction-side air suggesting a loose fitting.
- Stock rotation, so nothing is decanted from a long-open drum.
FAQs About Fertigation Room Layout
How big should a fertigation room be?
Big enough for the tanks plus a working aisle plus the space to remove equipment, usually considerably larger than tank footprint alone. Sizing from a percentage of greenhouse area produces a room that works on day one and not after the first retrofit.
Can the fertigation room share a wall with the packing area?
It is usually better not to. Food-safety auditors pay close attention to where chemicals sit relative to packed produce, and a shared door or drain becomes a finding to remedy later.
Where should A and B concentrate tanks be placed?
In the same room is fine, on separate containment with separated fill and suction lines. What matters is that nothing used on one concentrate can reach the other, and that both are labelled where the sight line falls.
How high should dosing pumps and manifolds be mounted?
High enough to read gauges and open valves without kneeling, typically around 900–1,400 mm from the floor, and low enough that a spare injector can be lifted in without a second person on a ladder.
Do acids and sanitisers need separate bunds?
Yes. Acid contacting hypochlorite releases chlorine gas, so those products belong in separate containment with their own trays rather than one shared secondary bund.
Related Reading
- Nutrient Solution Management: Recirculation vs Drain-to-Waste, EC Drift and Dump Cycles — How the water decisions made in this room behave out in the crop
- Hydroponic Water Treatment: RO, UV, and Ozone — What a site is allowed to send down the drain
- Hydroponic System Commissioning: Installation Sequence, Testing and Site Acceptance — Where the plant room stops being a drawing
- Critical Spare Parts for Hydroponic Farms: A Stock List Built on Downtime Risk — What to keep on the shelf by the dosing pumps
- Pipework Runs and Manifold Layout: Farm Rules — How the room connects to the rest of the house
Next Step: What to Send for a Quotation
Plant room equipment is quoted from the vessel count and the routing, not from a greenhouse size. Suppliers pricing tanks and dosing without knowing how many zones are fed, or where the room sits, will guess at both.
A fertigation room layout costs nothing extra to plan well and a great deal to correct after commissioning, since everything in it is already connected to everything else.
Building a new plant room or reworking one? For RFQ or project consultation, send: greenhouse dimensions and usable area; crop list; number of zones and their flow requirements; solution volumes and refill frequency; raw water analysis; room dimensions if retrofitting; preferred dosing and control arrangement; automation level required; delivery schedule; and the budget band. G AND N FORTUNE LIMITED supplies NFT channels and gutter systems with matched tank and dosing packages quoted to those parameters.
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