NanoJet™ for Eco Pools: Oxygen and Moving Water for the Biology That Keeps Your Pool Clear
An eco pool has no chlorine, so plants, biofilm and beneficial bacteria do the cleaning, and they run on oxygen and moving water. NanoJet™ feeds oxygen to your biofilter, keeps the floor and gravel from going stale, and moves the whole pool past your filter, so nature can keep the water clear without chemicals.
Have you had your water tested?
85% discover problems only after damage occurs. Get your water tested, then use our free tool to check your results against SANS 241 and get a tailored treatment recommendation.
How an Eco Pool Cleans Itself
Water travels in a loop from the swim zone, through a biofilter or planted regeneration zone, and back. Along the way, particles are caught, bacteria break down waste, and plants and biofilm strip out the nutrients algae need, especially phosphorus. Clear water in an eco pool comes down to keeping phosphorus very low.
Where Oxygen and Movement Make the Difference
Most eco pool problems start in the same places: stale gravel, oxygen-starved floors, dead corners and fine sludge. That is where NanoJet™ works.
1. Fuels the Biofilter
The bacteria in your biofilter are oxygen-hungry: converting ammonia to nitrate alone uses around 4.6 g of oxygen for every gram of ammonia-nitrogen. Oxygen-rich water fed into the bed keeps the biofilm working instead of going stale.
2. Helps Keep Phosphorus Locked Away
In oxygenated sediment, phosphate stays bound to iron in the gravel and floor. When sediment runs out of oxygen, that phosphorus can dissolve back into the water and feed algae. Keeping the floor oxygenated helps keep it bound.
3. Protects the Night-Time Low
Plants make oxygen by day but use it at night, so oxygen is lowest just before dawn. Running NanoJet™ overnight supports your pool when it needs oxygen most.
4. Fewer Dead Zones
Only the water that passes through your loop gets cleaned. NanoJet™'s turbulent plume reaches corners, steps and the floor, pushing more of the pool towards the skimmer, biofilter and filter.
5. Clearer, Polished Water
Keeping fine particles moving means they reach your filter instead of settling, decaying and releasing nutrients. Paired with a fine filter media, the result is clearer, polished water.
6. Less Sludge, No Rotten-Egg Smell
Fewer settled solids and an oxygenated floor mean less low-oxygen decay, the source of the "rotten egg" (H₂S) smell in stale corners. Moving water on walls and steps also makes it harder for stringy algae to take hold.
Results depend on your pool's design, planting, nutrient load, sunlight and bather numbers. NanoJet™ supports a healthy eco pool; it doesn't disinfect, and it doesn't replace a properly sized regeneration zone, good nutrient control or regular maintenance.
Still Water Feeds Algae. Get Your Eco Pool Moving.
Algae takes hold where water sits still: in dead corners, on the steps and in sludge on the floor. The Retrofit Pond & Pool VORTEX Assembly turns the return jet you already have into an oxygen-rich plume that keeps the whole pool moving past your filter and plants. One complete kit, venturi included. No builder, no new pipes, no chemicals.
Retrofit Pond & Pool VORTEX Assembly
Oxygenates and circulates the swim zone. Everything you need comes in one kit, venturi included.
- Complete kit: tee connector, ball valve bypass, venturi air injector, riser pipe and NanoJet™ VORTEX
- Plugs into your existing return jet with a PoolSkim Union Adapter: no new wall fittings, no new pipes
- The VORTEX sits about 1.5 m below the return jet, clear of automatic pool cleaners
- The bypass valve tunes the plume without overloading your pump
- Turbulent plume lifts oxygen through the full depth and reaches corners, steps and the floor
Best for: existing eco pools and ponds with dead corners, a sludgy floor or stringy algae on walls and steps. Supplied in kit form, pre-chamfered and ready to glue.
View & Buy in StoreWant NanoJet™ built into your pool's plumbing instead? Contact us: we'll design it for your pool and one of our recommended installers will fit it. Eco pools usually run low-pressure pond pumps. On these, NanoJet™ works in gentle circulation mode; for a full plume we add a small booster pump on a side-stream. We'll tell you which your pool needs.
Koi Pond Going Green? Still Water Feeds Algae.
Most koi ponds only get oxygen at the surface, from a waterfall or the return. Still corners grow algae and collect waste, and on hot summer nights oxygen runs lowest just before dawn, when your koi need it most. The same Retrofit Pond & Pool VORTEX Assembly plugs into your existing return and releases oxygen deep in the pond.
Oxygen from the bottom up
The VORTEX sits about 1.5 m below the return jet, so oxygen-rich water rises through the whole pond, not just across the surface like a waterfall.
No still corners for algae
The plume sets the whole pond turning and reaches the corners, steps and rock edges where algae and sludge take hold in still water.
Waste to the bottom drain
A steady floor current carries waste to your bottom drain and settlement chamber, instead of leaving it to rot on the liner.
A biofilter that keeps up
The bacteria that break down ammonia need oxygen. Oxygen-rich water reaching the filter helps them keep up in a busy summer pond.
That rotten-egg smell goes away
When a pond stands still, fish waste and uneaten food rot on the floor without oxygen and give off hydrogen sulfide, the gas behind the rotten-egg smell, which is toxic to fish even in tiny amounts. Switch NanoJet™ on and you may notice the smell at first as the gas is stripped out of the water. As oxygen reaches the floor the smell fades, because the bacteria that make it can't work in oxygen-rich water.
Koi pond aeration: good practice
- Aim to keep dissolved oxygen at 6 mg/L or more; 7–8 mg/L is better. Koi start to struggle below about 5 mg/L.
- Warm water holds less oxygen (about 9 mg/L at 20 °C and 8 mg/L at 25 °C), and koi use more when it's warm, so summer is the risky season.
- Oxygen is lowest just before dawn. Run aeration day and night through summer, and test at dawn, not in the afternoon.
- Aeration drives off CO₂, which can nudge pH up. Test pH regularly for the first few weeks.
- Restarting a pond that's stood still? Start with the bypass valve wide open and build up over a few days. Stirring up a rotting floor all at once can briefly stress your fish.
- Aim the plume across open water and leave calmer areas, so your koi can rest out of the current.
- NanoJet™ doesn't replace your bottom drain, filtration, water changes or regular testing.
Oxygen figures are general guidance from pond-aeration extension publications (e.g. SRAC 3700, Pond Aeration) and koi-keeping guides. Every pond is different, so test your own water.
Already Have a Sediment Filter? NanoJet™ Makes It Work Harder
A filter can only catch what reaches it. In still water, fine particles settle on the floor, decay, use up oxygen and release nutrients back into the pool. NanoJet™ and a sediment filter work as a pair:
- NanoJet™ keeps fines suspended: detritus, pollen, dead algae cells and clay, which carry much of the pool's particle-bound phosphorus.
- Water carries them to the filter instead of letting them settle into sludge.
- The filter traps them, and backwash sends them to waste. That phosphorus leaves the pool permanently.
- Oxygenated water reaches the filter, helping keep the filter bed from going anaerobic between backwashes.
Media matters: AFM® Grade 0 is reported by its manufacturer to remove 95–97% of particles at 1 µm, versus around 20 µm for sand (Dryden Aqua data, IFTS lab, 20 m/h, no flocculant). AFM® is a registered trademark of Dryden Aqua.
The Science: Micro-Bubbles, Nano-Bubbles & the Plume
Micro-Bubbles Do Most of the Work
At our 2.5 bar baseline, about 85% of NanoJet™ bubbles are micro-bubbles. A 30 µm bubble rises at around 0.5 mm/s, compared with about 25 cm/s for a coarse 3–5 mm bubble, and has roughly 100 times the surface area for the same volume of air. That long contact time is what drives oxygen transfer.
Nano-Bubbles: A Long-Lived Fraction
About 15% of bubbles are nano-scale. Laboratory studies report bulk nano-bubbles persisting for days to weeks, depending on water chemistry, although how they stay stable is still debated by researchers. They hold very little gas, so we treat them as a bonus rather than the main oxygen source.
The Turbulent Plume
The NanoJet™ eductor drags along several times its own flow of surrounding water, and the rising bubbles add their own turbulence. The result is a plume that mixes the pool far more strongly than a plain return jet.
Biology Does the Cleaning
NanoJet™ adds no chemicals. It gives the bacteria, biofilm and plants that clean your eco pool the oxygen and water movement they need. Read the full science →
Good to Know Before You Fit NanoJet™
What NanoJet™ doesn't do
- It doesn't disinfect. Pathogens are controlled by your pool's biology, filtration and UV.
- It doesn't remove phosphorus by itself; it helps keep it bound and moving to your filter.
- It doesn't replace a properly sized regeneration zone or regular maintenance.
How we install it
- The nozzle sits about 20% of the depth up the wall, not on the floor, so automatic pool cleaners pass underneath without getting stuck.
- The NanoJet™ Retrofit Pond & Pool VORTEX Assembly, including a venturi air intake, fits onto your pool's existing return jet with a PoolSkim adapter and hangs inside the pool wall, just under the surface, so there are no new wall fittings and no pipes run under the floor.
- Plumes are aimed across the swim zone, not into the planted zone, so roots and the low-oxygen pockets that remove nitrate are left undisturbed.
- Aeration releases CO₂, which nudges pH up. Check pH late on a sunny afternoon for the first few weeks.
- Plumes are kept clear of steps, ladders and jump-in areas: bubbly water is less buoyant.
- Nozzle sizing accounts for your pump, so flow through the biofilter isn't cut.
Send Us Your Eco Pool Details
Tell us your pool's size and depth, how it's filtered (planted zone, gravel biofilter, sediment filter), your pump model and what's bothering you. We'll check the assembly suits your pool and pump.