White fine pre-filter and carbon filter with black labels, side by side, for reverse osmosis units producing 190 and 380 L per day

Inline carbon filter with black label, 1/4 inch fitting at each end

Blue reverse osmosis membrane for a 190 L per day RO unit, in front of its box

Blue reverse osmosis membrane for a 380 L per day RO unit, white end cap at the top

White fine filter for a 400 L per day RO unit, shown in front of its black box

C1 carbon filter for a 400 L per day reverse osmosis unit, shown in front of its black box

C2 carbon filter for a 400 L per day reverse osmosis unit, shown in front of its black box

Membrane for a 400 L per day reverse osmosis unit, shown in front of its black box

White resin cartridge with orange ends for a 400 L per day reverse osmosis unit

Cartridges and membranes for ARKA myAqua 190, 380 or 400 reverse osmosis units

Name: Cartridges and membranes for ARKA myAqua 190, 380 or 400 reverse osmosis units
Brand: ARKA
SKU: MAFS
Availability: InStock

¥2,900

¥967 × 3 with no fees Klarna.

These replacement parts refresh the compact ARKA myAqua reverse osmosis units rated 190, 380 and 400 L per day: pre-filters, carbon filters, membranes and resin, to be chosen for your model in the selector.

Ref. MAFS·Cartridge for reverse osmosis unit

Pièce : Set fin et charbon, 190 et 380

Set fin et charbon, 190 et 380

Filtre charbon, 190 et 380

Membrane 190

Membrane 380

Filtre fin, 400

Filtre charbon C1, 400

Filtre charbon C2, 400

Membrane 400

Filtre résine, 400

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Delivery within 2 to 15 business days

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The summary

What it is: replacement cartridges and membranes for compact reverse osmosis units producing 190, 380 and 400 L per day.
Which model it suits: a set of 2 pre-filters and one membrane per flow rate for the 190 and the 380, 5 pieces for the 400.
When to replace: the fine pre-filter every 3 months, the carbon every 6 months, the membrane after 2 years of use.
How it arrives: in a small parcel delivered to your door, each piece in its original box.

Pre-filters, carbon, membranes and resin to keep osmosis water pure

A reverse osmosis unit produces pure water as long as its filters retain what they are meant to retain. The pre-filters first stop particles and the chlorine in tap water, then the membrane retains up to 99% of dissolved salts thanks to pores of 0.0001 micron. These parts wear out with the volume produced, and replacing them regularly restores the water quality of the first days. The parts offered here cover the three compact ARKA myAqua reverse osmosis units: those for the 190 and the 380, which share their pre-filters, and those for the 400.

🔍 Which part for which model

The 190 and 380 L per day models, shown on the compact reverse osmosis unit page, use the same 25 cm in-line cartridges with 1/4 inch fittings. Only their membrane differs, since it sets the output of the unit. The 400 L per day model works with four cartridges of its own, plus an optional resin cartridge to polish the water produced even further. Check the number printed on your unit before choosing, because the parts of one model do not fit the other.

190 and 380

The set includes the fine pre-filter and the carbon filter, and the membrane is chosen according to the unit's flow rate.

400

One fine filter, two carbon filters C1 and C2, a membrane and an optional resin.

The membrane

It holds back dissolved salts, and its reference follows the flow rate of the RO unit.

🗓️ The water change schedule

On the 190 and the 380, the 5 micron fine pre-filter is changed after 11,000 litres or 3 months, and the carbon filter after 5,500 litres or 6 months, whichever limit is reached first. The membrane is replaced after 24 months of use. On the 400, the filters are changed after 6 to 12 months at the latest, and the membrane when the quality of the water produced drops. The deciding factor remains measurement: osmosis water that exceeds 50 ppm of dissolved salts signals a worn part.

Measure the KH once the water has been remineralised

Reverse-osmosis water contains almost no carbonates, so its pH becomes unstable until you remineralise it. The KH carbonate hardness drop test tells you how much carbonate your mixture contains before you pour it into the tank. This way you avoid filling an aquaponics tank with water that would let the pH drop within a few days.

The carbon protects the membrane

The carbon filter holds back the chlorine in tap water, which would damage the membrane if it reached it. So never run the reverse osmosis unit without a carbon filter, and replace it when it is due even if the water produced is still good. Also rinse each new cartridge by letting the first water produced run to waste.

♻️ The resin in the 400 model

The resin cartridge fits after the 400's membrane and removes the last traces of silicates, nitrates and other dissolved substances. It contains an equal-parts mix of cationic and anionic resins, which binds the remaining ions and produces water with a conductivity close to 0.1 µS/cm. This level of purity is mainly useful for marine aquariums, where water free of silicates and nitrates is the goal. In aquaponics, you remineralise the osmosis water anyway before adding it to the system, so the reverse osmosis unit alone is usually enough, as explained in the article on pH regulation in aquaponics.

Technical specifications

Models 190 and 380

Fine pre-filter: 5 µm, polypropylene11,000 L or 3 months at most
Carbon filter: Activated carbon5,500 L or 6 months at most
Membranes: Pores of 0.0001 µm24 months of use, flow rate of 190 or 380 L per day
Fittings: 1/4 inch on both sides25 cm cartridges, 30 cm membranes

Model 400

Fine filter: 1 µm, polypropylene
Carbon C1 and C2: Active block, then pelletsThe C2 contains coconut shell carbon
Membrane: Retention of up to 99%
Resin: Mixed bed, approximately 0.1 µS/cmOptional cartridge, fitted after the membrane

Conditions of use

Pressure: 2.4 to 5.5 bar or 1 to 4 barFor the 190 and the 380, then for the 400
Water temperature: 4 to 38 °C or 5 to 45 °CFor the 190 and the 380, then for the 400

To budget for separately

Checking the water produced: A TDS testerBelow 50 ppm, the reverse osmosis water is of good quality
Checking after remineralisation: A KH testBefore any use in a stocked tank

4 further specifications are available in the detailed view.

In the box

1 cartridge or 1 membrane, or the set of 2 pre-filters, depending on the part chosen

Fineness ratings, volumes, intervals, pressures and temperatures recorded on 08/10/2026 from the data for the compact reverse osmosis unit and its parts.

The parts for your reverse osmosis unit

One membrane per model, with pre-filters shared by the 190 and the 380. The number printed on your unit points you to the right column.

Which membrane for your unit? Enter your model and the matching column is highlighted.

	Model	Production (L per day)	Matching pre-filters	Water pressure	Power socket	Price
Recommended Cartridges and membranes for ARKA myAquaYour choice	myAqua 190	190 L per day	Fine and carbon set	2.4 to 5.5 bar	No	¥5,100
Cartridges and membranes for ARKA myAquaYour choice	myAqua 380	380 L per day	Fine and carbon set	2.4 to 5.5 bar	No	¥8,200
Cartridges and membranes for ARKA myAquaYour choice	myAqua 400	400 L per day	Fine, C1 and C2	1 to 4 bar	Yes	¥6,900

Cartridges and membranes for ARKA myAquaRecommended

The RO unit

ModelmyAqua 190

Production (L per day)190 L per day

Matching pre-filtersFine and carbon set

Conditions of use

Water pressure2.4 to 5.5 bar

Power socketNo

Cartridges and membranes for ARKA myAqua

The RO unit

ModelmyAqua 380

Production (L per day)380 L per day

Matching pre-filtersFine and carbon set

Conditions of use

Water pressure2.4 to 5.5 bar

Power socketNo

Cartridges and membranes for ARKA myAqua

The RO unit

ModelmyAqua 400

Production (L per day)400 L per day

Matching pre-filtersFine, C1 and C2

Conditions of use

Water pressure1 to 4 bar

Power socketYes

Output, pre-filters and pressures taken on 08/10/2026 from the data for the compact reverse osmosis unit.

Estimate your
delivery time

The parts are sent in a small parcel, each in its original box, delivered to your home by Colissimo or Chronopost, your choice at checkout. The exact cost is calculated in your basket according to the total weight of your order.

Frequently asked questions

6 questions

6 key questions

Which part matches my reverse osmosis unit?

RO unit	Pre-filters	Membrane
190 L per day	Fine and carbon set, 190 and 380	Membrane 190
380 L per day	Fine and carbon set, 190 and 380	Membrane 380
400 L per day	Fine filter, C1 and C2, 400	Membrane 400

How often should the parts of the 190 and 380 be replaced?

Does the set include both pre-filters?

How do you know the membrane is worn out?

How do I replace a cartridge?

Is the resin in the 400 necessary?

For a freshwater aquarium or an aquaponics tank, no: the water coming out of the membrane is enough, and you remineralise it before use.

For a marine aquarium, the resin removes the last silicates and nitrates, which is what reef tanks are after. It is placed after the membrane and wears out all the faster the more heavily loaded the water reaching it is: a membrane in good condition therefore extends its lifespan.

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Interest-free instalment payments

Offered depending on the cart amount, at checkout.

Delivery in 2 to 15 working days

Depending on the products and shipping sites. Estimate by destination in the estimator on this page.

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Cartridges and membranes for ARKA myAqua 190, 380 or 400 reverse osmosis units

The summary