GrowMax High Flow Pump Kit - Boosts Pressure for Slow-Running RO Systems
Best for: growers whose GrowMax reverse osmosis unit is producing water slower than it should because incoming mains pressure is too low.
Our thoughts
If your GrowMax RO unit is dribbling out water slower than the spec sheet promises, low mains pressure is almost always the reason, not a fault with the unit itself. This is the genuine fix for that, a proper GrowMax part rather than a generic aquarium pump bolted on and hoped for.
The GrowMax High Flow Pump Kit is a booster pump kit built to restore proper output on a GrowMax reverse osmosis system when incoming water pressure is too low to drive it at full capacity. The kit includes a booster pump, transformer, pressure shut-off switch and the tubing needed to fit it, and works by boosting outlet pressure to 60psi or higher.
It's recommended when your inlet water pressure is below 3 bar (around 45psi), which is common on older plumbing or properties with naturally low mains pressure. Boosting pressure back up not only restores your RO unit's rated output, it also reduces the amount of wastewater the system produces while filtering, since low-pressure RO tends to waste more water for less product.
How it compares
This is a targeted fix for a specific problem, not a general upgrade.
- Running a GrowMax RO unit on unboosted low-pressure mains means slower output and more wastewater for the same filtered volume
- Generic aquarium booster pumps may run at a similar pressure but aren't matched to GrowMax's fittings or pressure switch calibration, so fit and reliability aren't guaranteed
- Replacing the whole RO unit is unnecessary if the actual issue is inlet pressure rather than a worn membrane or filters
If low pressure is genuinely your problem, this sorts it properly rather than being an unnecessary extra.
Usage guidance
Confirm the actual cause before fitting, since a slow RO unit isn't always a pressure issue.
Checking if you need one
If your RO unit is producing noticeably less than its rated output and your filters and membrane are otherwise in good condition, check your mains pressure. Below 3 bar (45psi) is the point where a booster pump kit typically helps.
Fitting the kit
The pump fits inline ahead of your RO unit, with the pressure shut-off switch protecting the pump from running dry or against a closed system.
What's in the box
Booster pump, transformer, pressure shut-off switch and connecting tubing, everything needed to fit it without sourcing extra parts.
Technical specifications
- Boosted outlet pressure: 60psi or higher
- Recommended for inlet pressure below: 3 bar / 45psi
- Kit contents: booster pump, transformer, pressure shut-off switch, tubing
- Compatibility: GrowMax reverse osmosis systems, including Mega Grow 1000 and Pro 3000
- Fitting: genuine GrowMax part
Who this is for
- Owners of a GrowMax RO system running on low mains pressure
- Growers noticing slower or reduced RO output than expected
- Anyone setting up a GrowMax unit in a property with known weak water pressure
- Growers wanting to reduce RO wastewater as well as restore output
Best suited to a confirmed low-pressure issue rather than a general upgrade to a healthy system.
Our take
This is a proper fix for a specific, common problem rather than an optional extra, and being a genuine GrowMax part means it's built to match the pressure switch and fittings your RO unit already uses.
Proper construction at a price that makes sense. Worth picking up if low mains pressure is genuinely holding your RO system back.
