One-litre bottle of Oxydator solution next to a small Mini bottle, on a white background

Small bottle of solution for Oxydator Mini, green cap

One-litre bottle of 3 % solution for the Oxydator, red cap

One-litre bottle of 6% solution for Oxydator, translucent plastic

Cylindrical grey ceramic catalyst for Oxydator W, A and D

Replacement ceramic catalyst for Oxydator Mini

Söchting replacement solution and catalysts for the Oxydator

Name: Söchting replacement solution and catalysts for the Oxydator
Brand: Söchting
SKU: 130109
Availability: InStock

$4.46

$1.48 × 3 with no fees Klarna.

This stabilised hydrogen peroxide solution feeds your Oxydator oxygenator: the 82.5 ml bottle at 4.9% fills the Mini, the litre at 3% is for the D and the litre at 6% is for the A, or for the D in a heavily stocked tank.

Ceramic replacement catalysts are available for the Oxydator W, A and D, and for the Mini.

Ref. 130109·Oxygenation

Format : 82,5 ml à 4,9 %, pour mini

82,5 ml à 4,9 %, pour Mini

1 L à 3 %, pour D

1 L à 6 %, pour A

Catalyseur pour Oxydator W, A et D

Catalyseur pour Oxydator Mini

Customer support 7 days a week by email

Delivery within 2 to 15 business days

100 % secure payment

The summary

What it is: a stabilised hydrogen peroxide, and the ceramic catalysts that break it down into water and dissolved oxygen.
Which bottle: 4.9% for the Mini, 3% for the D, 6% for the A or for a D on a heavily stocked tank.
How long it lasts: one litre makes about 8 refills of an Oxydator D, which is several months.
How to handle it: wearing gloves and goggles, with the bottle recapped and stored upright.

Replacement solution and catalysts for Oxydator, at the strength specified for each model

An Oxydator oxygenator uses no electricity, but it does use up this solution. It is hydrogen peroxide, stabilised so that it breaks down steadily on contact with the ceramic catalyst inside the unit. Each drop that leaves the reservoir becomes water and oxygen dissolved in your tank, with no other residue.

🧪 Three concentrations, three models

The more concentrated the solution, the more oxygen the unit releases each day, and the faster the refill is used up. The small 82.5 ml bottle at 4.9% matches the Mini's reservoir, which it fills in one go. The 3% litre is for the Oxydator D in an ordinary aquarium, while the 6% litre suits the Oxydator A, which covers up to 400 litres, as well as a D placed in a tank of around 100 litres or one that is heavily stocked. A litre at 3% releases roughly 15 g of oxygen in total, and a litre at 6% releases about twice that.

A thermometer to anticipate the next recharge

The rate of decomposition roughly doubles with every 8 °C, so the water temperature decides how long each refill lasts. A suction-cup aquarium thermometer stuck to the glass lets you read this value at a glance. That way you can plan the top-up when the water warms in summer, instead of finding an empty reservoir on a hot day.

A solution that stings the eyes

The label carries the Danger signal word and the H318 statement: the solution causes serious eye damage if splashed. Wear gloves and goggles when filling the unit, and recap the bottle straight away. In case of contact with an eye, rinse cautiously with water for several minutes, remove contact lenses if possible, then call a poison centre or a doctor immediately.

The level can be read through the glass reservoir of the oxygenator, and you refill when it is almost empty. The reservoir of an Oxydator D holds about 125 ml, so one litre represents roughly 8 refills. At 2 to 4 weeks per refill at 25 °C, that litre lasts several months, and even longer in cool water.

🐟 A reserve for aquaponics

In an aquaponics system, the oxygenator serves mainly as a backup during a power cut, and it is only useful if it is full on that day. So keep a spare bottle next to the tank to refill as soon as the level drops. A 6% solution in an Oxydator D delivers more oxygen per hour, which suits the fish tank of a small system, where the biomass consumes more than an ornamental aquarium. The guide to maintaining your aquaponic system in summer brings together the precautions to take when the water warms up.

🪨 Replacement catalysts

The catalyst is the porous ceramic part that breaks down the solution in your unit, and the model used in the Oxydator W, A and D has a different reference from the one used in the Mini. In the Oxydator A, the number of catalysts fitted sets the output: in a 100 to 200-litre tank with the 6 % solution, a single catalyst releases about 270 mg of oxygen per day and a refill lasts around forty days, whereas two catalysts double this supply and halve the duration. With a spare catalyst, you can switch from one setting to the other depending on the load in your tank.

🧴 Storing the bottle

The solution should be stored in its original bottle, tightly closed, upright, in a cool place away from light and out of the reach of children. No foreign matter should get into it, neither tap water, nor dust, nor the remains of an earlier filling, as this would destabilise the solution. If you ever dilute a stronger solution, do so only with distilled water. The bottle carries a use-by date, so keep in reserve the quantity needed for one season rather than a stock that will last several years.

Technical specifications

The three sizes

For the Oxydator Mini: 82.5 ml at 4.9%One bottle fills the reservoir once
For the Oxydator D: 1 L at 3%The 6% litre bottle is also suitable for a D dose in a heavily stocked tank
For the Oxydator A: 1 L at 6%For volumes of 100 to 400 litres and small ponds
Composition: Stabilised hydrogen peroxideIt breaks down into water and oxygen on contact with the catalyst

Yield and catalysts

Oxygen per litre at 3%: Approximately 15 gReleased gradually, over the course of the refills
Oxygen per litre at 6%: Approximately 30 gDouble, for a higher daily output
Catalyst W, A and D: Porous ceramic partTwo catalysts in the Oxydator A double the oxygen output
Mini catalyst: Part specific to the Mini

Safety and storage

Ranking: Danger, H318Serious eye damage if splashed
Protection: Gloves and gogglesAdvice P280, P305+P351+P338 and P310
Storage: Upright, sealed, in a cool placeAway from light and out of reach of children
Dilution: Distilled water onlyAny foreign matter destabilises the solution

To budget for separately

The oxygenator: Oxydator Mini, D or A
Protection: Gloves and safety goggles

6 further specifications are available in the detailed view.

In the box

1 sealed bottle of solution or 1 replacement catalyst, depending on the size chosen

Concentrations, uses by model, oxygen output and hazard statements noted on 11/10/2026 from the Söchting usage table and the bottle labels. Yield calculated from 156 g of oxygen per litre of 30% solution.

Which bottle for which Oxydator?

Three concentrations, each designed for one model. The strongest releases more oxygen each day.

The right percentage first time Tell us which appliance you have, and the table points to the bottle that matches it.

	For the Oxydator	Concentration (%)	Capacity (ml)	Filling time at 25 °C	Price
82.5 ml at 4.9%Your choice	Mini	4,9 %	82,5 ml	2 to 4 weeks	$4.46
Recommended 1 L at 3%Your choice	D	3 %	1000 ml	2 to 4 weeks	$11.33
1 L at 6%Your choice	A, or D on a heavily stocked tank	6 %	1000 ml	20 to 40 days in the A	$11.33

82.5 ml at 4.9%

For the OxydatorMini

Concentration (%)4,9 %

Capacity (ml)82,5 ml

Filling time at 25 °C2 to 4 weeks

1 L at 3%Recommended

For the OxydatorD

Concentration (%)3 %

Capacity (ml)1000 ml

Filling time at 25 °C2 to 4 weeks

1 L at 6%

For the OxydatorA, or D on a heavily stocked tank

Concentration (%)6 %

Capacity (ml)1000 ml

Filling time at 25 °C20 to 40 days in the A

Concentrations, uses by model and durations at 25 °C recorded on 11/10/2026 from the Söchting usage table and the bottle labels.

Estimate your
delivery time

The bottle is dispatched sealed and upright, by Colissimo or Chronopost home delivery, your choice at checkout. The exact cost is calculated in the basket based on the total weight of your order.

Frequently asked questions

6 questions

6 key questions

Which bottle for my Oxydator?

Each model is designed for one concentration, with a stronger option for the D.

Unit	Bottle	Use
Mini	82.5 ml at 4.9%	Nano and small tanks up to 60 litres
D	1 L at 3%	Standard aquarium up to 100 litres
D or A	1 L at 6%	Heavily stocked tank, large aquarium, small pond

Can I use pharmacy hydrogen peroxide?

How long does one litre last?

Which catalyst for my Oxydator?

Can I switch from 3% to 6% in an Oxydator D?

Does the solution expire?

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Söchting replacement solution and catalysts for the Oxydator

The summary