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Reverse Osmosis Systems

Nutrient charts assume clean water as a baseline — and tap or well water rarely is. Dissolved solids, chlorine, and chloramine all throw off the PPM numbers a feed schedule is built around, which means a reverse osmosis system isn't optional once precision starts to matter. Sizing comes down to how fast a reservoir needs filling: the GrowoniX EX200 covers a single tent, while a room turning over multiple reservoirs a day needs the throughput of the GrowoniX GX1000.

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Buyer's Guide

Reverse Osmosis Systems: Complete Guide

Zero Out Feed Water Chemistry Before It Reaches the Reservoir

An RO system exists to make the numbers on a feed chart mean what they say. By rejecting 95-98% of total dissolved solids along with chlorine and chloramine, it gives every mix a clean, repeatable starting PPM instead of an unknown baseline that shifts with the municipal supply.

What GPD Rating Actually Gets You

Gallons per day is the spec that matters most, and it scales with reservoir volume and how often nutrients get mixed.

Grow Scale GPD Rating Example Unit
Compact or stealth setup, small reservoir 150 GPD HydroLogic Stealth-RO150
Tent or small closet, one or two reservoirs 200 GPD GrowoniX EX200
Multi-tent room, daily reservoir turnover 1,000 GPD GrowoniX GX1000
Commercial cultivation, multiple rooms 4,000+ GPD Axeon N-4000

Facilities running multiple flowering zones often step past the N-4000 into the larger Axeon N-Series, which scales up to 16,000 GPD for shifts that require hundreds of gallons at once.

What Actually Determines RO Performance

The GPD number on the box is a ceiling, not a guarantee — a handful of other factors decide whether a system hits it.

  • TDS rejection rate: Most grow-room systems reject 95-98% of dissolved solids; the Axeon N-4000 runs a dual-membrane array at a nominal 98.5% rejection with 48% system recovery.
  • Feed water pressure: Rated GPD output assumes 40-80 PSI of incoming pressure. Systems on low-pressure lines fall short of their rating until a booster pump gets added ahead of the membrane.
  • Pre-filtration stage: Chlorine and chloramine degrade membranes fast when they hit directly; running through water dechlorinators first extends membrane life considerably.

Sizing for Source Water, Not Just Grow Space

The right system depends on feed water quality as much as output volume.

  • Municipal water, small footprint: The HydroLogic Stealth-RO150 lowers TDS by up to 98% in a compact, low-profile housing built for gardens that don't need commercial output.
  • Well water with sediment or iron: Heavy sediment loads clog membranes fast; pair an RO system with sediment water filters ahead of it rather than letting the membrane absorb the load.
  • Aging membrane, dropping output: A steady decline in rejection rate or flow signals it's time to check replacement membranes sized to the system.

Every model here handles storage differently — higher-GPD systems assume filling a tank directly rather than running on demand, so tank size should match the mixing schedule, not just the membrane's rated output. For a full walkthrough on matching GPD to grow space, see the RO sizing guide.

Buying Context

Already have clean water and just need the next stage? See the full water management lineup, from pre-filtration through sterilization.

Frequently Asked Questions

What size reverse osmosis system do I need for a grow tent?
A 150-200 GPD system covers a single tent or small closet running one or two reservoirs a week. If a reservoir fills daily, step up to a 1,000 GPD unit so fill time stays under an hour.
Does a reverse osmosis system remove chlorine from tap water?
RO membranes reduce chlorine somewhat, but chlorine and especially chloramine shorten membrane lifespan when they hit it directly. A carbon pre-filter or dechlorinator stage ahead of the RO unit protects the membrane and is standard practice on municipal water.
Why is output slower than the system's rated GPD?
GPD ratings are measured at ideal feed pressure, typically 60-80 PSI, and moderate water temperature. Cold water, low incoming pressure, or a partially fouled membrane can cut real output well below the rated number.
Can an RO system run on well water?
Yes, but well water often carries more sediment and iron than municipal supply, which clogs pre-filters faster. Check hardness and iron content before sizing, since heavy sediment loads call for a dedicated sediment filter stage ahead of the membrane.
How often do RO membranes need to be replaced?
Most grow-room membranes last 2-3 years with proper pre-filtration, though heavy chlorine exposure or high sediment load can cut that in half. A steady drop in rejection rate or output is the signal to check replacement membranes.
Is a booster pump necessary with a reverse osmosis system?
If incoming water pressure runs below 40 PSI, a booster pump raises it into the range most membranes need to hit their rated GPD. Homes on well systems or upper floors of multi-unit buildings run into this most often.
What's the difference between a 95% and a 98.5% TDS rejection rate?
A higher rejection rate leaves less dissolved solids in the finished water, giving a lower and more consistent starting PPM before nutrients get added. The gap matters most on source water that already carries high mineral content.
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