Pond Dechlorinators
Complete inline purifiers for safer pond filling, water changes and automatic top-ups
Choose by realistic flow, total top-up volume, cartridge capacity, connections and the cost of keeping the media fresh. Do not compare housings by size alone.
Our practical advice: check compatibility, realistic flow and ongoing replacement cost before ordering. If you are unsure, send us the current housing or model details and we will help you match the correct product.
We stock compact hose-fed units, larger refillable cylinders and three-stage cartridge housings. They all sit under “dechlorinators”, but their capacity, flow and replacement method are very different. A small inline unit may be perfectly sensible for occasional modest top-ups; a heavily stocked koi pond on continuous trickle-in needs a unit whose carbon volume and service plan match that workload.
We are happy to help with the unglamorous details—tap pressure, hose bore, chloramine, replacement media and how long a water change can realistically take—because those are the details that decide whether a purifier protects the pond.
Comparing Complete Pond Dechlorinator Units
Burtons three-stage cartridge housings
The Burtons 10 inch three-stage dechlorinator is rated at 6 litres per minute with an indicative 9,100 litre capacity. The 20 inch Burtons dechlorinator increases the recommended flow to 8 litres per minute and the guide capacity to around 45,000 litres. Both use a sediment pre-filter, GAC and CTO carbon block.
Sealed inline and refillable cylinder purifiers
The Oase Inline Dechlorinator, Evolution Aqua Detox 12 Inch and Detox 30 Inch provide convenient complete units. Aqua Source and Pro-Line cylinder or pod purifiers provide further capacities and formats. Check whether replacement means changing a cartridge, replacing loose carbon or servicing the complete vessel.
Flow control matters more than a quick refill
Carbon needs contact time. If mains pressure pushes water through faster than the stated rate, the outlet can look normal while treatment is incomplete. Use a flow meter or timed-container test, label the installation date and occasionally test the treated outlet for chlorine.
Plan for frost, isolation and servicing
Support the housing, fit it where leaks can be seen, and leave room to open it. Any outdoor unit containing water must be protected from freezing. For automatic top-up systems, add a service record and a fail-safe arrangement rather than treating the purifier as maintenance-free.
Choosing Pond Dechlorinators
For occasional top-ups, a compact unit can be perfectly adequate; larger water changes and continuous trickle-in systems need more carbon capacity and a clear replacement schedule. Compare the recommended flow and treated-water capacity, then make sure the housing can be isolated, drained and opened without dismantling the surrounding pipework.
Frequently Asked Questions
What does a pond dechlorinator remove?
Its exact performance depends on the cartridges fitted. The Burtons three-stage units use sediment, GAC and carbon block stages to reduce chlorine, chloramine, particles and other impurities.
Which Burtons size should I choose?
The 10-inch unit suits modest top-ups at 6 litres per minute. The 20-inch unit has greater media capacity and is rated up to 8 litres per minute.
Does slower flow improve treatment?
Yes. Staying within the recommended rate gives the media more contact time with the water.
Can I use a timer or automatic top-up?
Yes, but check the unit regularly and record the volume treated because cartridge exhaustion can otherwise go unnoticed.
Do the units include cartridges?
Yes. The Burtons 10-inch and 20-inch three-stage units are supplied with their standard cartridge set.
Can I add water straight to the pond?
After the cartridges have been flushed and the outlet water has been verified, the hose can feed the pond at the recommended flow.
What happens if the unit freezes?
Water trapped in a housing can expand and crack it. Drain and store the purifier somewhere frost-free.
How do I test the outlet water?
Use an appropriate low-level chlorine test and sample the water after it has passed through the complete purifier.
Does the unit need electricity?
No. These inline dechlorinators are driven by mains water pressure.
Can I use the 20-inch cartridges in a 10-inch housing?
No. Cartridge length must match the housing exactly.
Why are three stages used?
The sediment stage protects the carbon, GAC provides broad adsorption and the carbon block provides a final polishing stage.
Can I run the purifier backwards?
Follow the marked inlet and outlet direction so each stage is used in the intended sequence.
What if I need water faster?
Use a larger correctly rated purifier or add a suitable liquid dechlorinator. Do not exceed the unit flow simply to shorten the refill time.
How long can a flushed cartridge be stored?
Once wet, media should not be left stagnant for long periods. Follow the manufacturer guidance and replace any cartridge whose condition is uncertain.
Can you help match fittings?
Yes. Send us the hose size and clear photographs of the connections before ordering adaptors.
