Blister pack for the JBL PROAQUATEST Cu refill, two reagent bottles for the copper test

Reagent refill for copper Cu test

Name: Reagent refill for copper Cu test
Brand: JBL
SKU: J2411500
Price: 8.2 EUR
Availability: InStock

8,20 €

2,73 € × 3 with no fees Klarna.

These two bottles contain the reagents for the copper test, sufficient for approximately 50 measurements. They measure only the copper that remains dissolved in the water — the form that affects your livestock.

Outside of treatment, levels should stay below 0.05 mg/L, and readings are taken by comparing two samples in the comparator block. The test tubes, sampling syringe, comparator block, and colour chart from your kit remain in use.

Ref. J2411500·Reagent refill

Customer support 7 days a week by email

Delivery within 2 to 15 business days

100 % secure payment

The summary

What it measures: dissolved copper that is still circulating in the water.
What the kit contains: 2 reagent bottles.
How many tests: approximately 50, the count supplied with the original kit.
When to use it: before introducing shrimps, and at the end of a treatment.
The waiting time: 15 minutes before reading, without exception.
Refill or complete kit: the refill is sufficient if your comparator block and both test tubes are in good condition.

The two reagents for the copper test, approximately 50 measurements, for aquarium and pond.

Copper most commonly enters a tank via tap water that has been standing in copper pipework, and sometimes through an antiparasitic medication or an anti-algae product containing it. These two bottles are the reagents only for the drop-based copper test, for approximately 50 measurements in fresh water, salt water, and pond water.

The reaction only colours dissolved copper, the copper that is actively affecting your animals at the moment of testing. Copper already deposited on the substrate as insoluble compounds does not appear in the result, nor does copper that a water conditioner has bound: this complexed copper no longer poses any danger to the tank's inhabitants, and it is removed through water changes and filter cleaning. Your reading therefore shows the fraction that actually matters to your shrimps and fish.

🎨 15 minutes of development

Fill two 5 ml test tubes, then add 5 drops of reagent 1 to one of them, mix, then add 5 drops of reagent 2 and mix again. The colour takes 15 minutes to develop fully, and an earlier reading will underestimate the concentration. Place both test tubes in the comparator block, the reference test tube compensating for the natural colour of your water, then slide the block along the colour chart until the colours match.

Activated carbon to filter out dissolved copper

If your reading shows copper with no treatment having been applied, place activated carbon in your filter, which adsorbs dissolved copper. Retest a few days later using this same set of bottles before introducing any invertebrates. The ammonium test is a useful complement to this check, since unexplained losses can also be caused by nitrogen.

The first flush from the tap concentrates copper

Run the tap for a few seconds to flush stagnant water from the pipe before filling a bucket destined for the tank, as standing water is where copper concentrations are highest. For the same reason, avoid using rainwater collected from copper guttering, and only install copper-free metal fittings in your tank or pond.

🦐 Invertebrates, fish and crops

Outside of targeted treatment, the copper level in a tank should remain below 0.05 mg/L, whether in fresh water, salt water, or a pond. You would therefore reach for these bottles before introducing shrimps or snails, after an unexplained die-off, and at the end of a copper-based treatment to confirm the water is clear of it. In aquaponics, copper added to the fish tank then circulates through your growing beds, and the guide on controlling pests in aquaponics covers solutions that introduce none.

🧴 Storing both bottles

Only reagent 2 is classified, with the Warning signal word and the H226 and H319 statements: flammable liquid and causes serious eye irritation. Store both capped bottles dry, at room temperature, in their original packaging, away from lighting rigs or any heat source. As the level must remain below 0.05 mg/L outside treatment periods, most of your readings will fall on the first field of the colour chart, and the 50-test kit covers several treatments and several invertebrate introductions.

Technical specifications

What the refill contains

Contents: 2 reagent bottlesReagents 1 and 2, with child-safety caps
Measurements: Approximately 505 drops of each reagent per measurement, for the same volume as in the original kit

Measuring copper

Recommended level: Less than 0.05 mg/LOutside of treatment, in freshwater or marine aquariums as well as ponds
Waiting time: 15 minutesUntil the colour has fully developed. Reading it early will underestimate the actual concentration

Reference and safety

Manufacturer's reference: JBL 2411500, PROAQUATEST rangeNot to be confused with 2411400, which is the complete kit
Hazard classification: Caution, reagent 2H226 and H319 statements. Reagent 1 is not classified

To budget for separately

Glassware and syringe: Those from the copper testTwo are needed, one treated and one in untreated water to cancel out the natural colour of the water
Comparator block and colour chart: Those from the copper testThe colour chart carries a freshwater scale and a marine scale, which the block places face to face

In the box

2 reagent bottles with child-resistant caps

Reference, EAN code, contents, protocol, number of tests and hazard statements taken from the JBL product page and instruction leaflet on 07/10/2026. Recommended concentration: JBL PROAQUATEST brochure.

The reagents alone, or the copper kit?

The chemistry and measurement count are identical on both sides. What distinguishes the two boxes is the comparison equipment, which can be kept from one set of reagents to the next.

This test reads two samples at the same time You need one treated test tube, one reference test tube, and a block that places them side by side against the correct scale. Refilling requires all three parts to be in good condition.

	Reagent bottles (bottles)	Possible readings (measurements)	Screw-top glass test tubes	Graduated sampling syringe	Comparator block with reading notch	Freshwater and marine colour chart	Price
Recommended Reagent refill for copper Cu testYour choice	2 bottles	50 measurements	No	No	No	No	8,20 €
Copper Cu water test in dropsYour choice	2 bottles	50 measurements	Yes	Yes	Yes	Yes	16,50 €

Reagent refill for copper Cu testRecommended

What gets used up

Reagent bottles (bottles)2 bottles

Possible readings (measurements)50 measurements

What keeps well

Screw-top glass test tubesNo

Graduated sampling syringeNo

Comparator block with reading notchNo

Freshwater and marine colour chartNo

Budget

Copper Cu water test in drops

What gets used up

Reagent bottles (bottles)2 bottles

Possible readings (measurements)50 measurements

What keeps well

Screw-top glass test tubesYes

Graduated sampling syringeYes

Comparator block with reading notchYes

Freshwater and marine colour chartYes

Budget

Contents of both columns taken from the supplier's data sheet and instruction leaflet, on 05/09/2026.

Estimate your
delivery time

Parcel weight 0.08 kg, dispatched to a collection point or to your home address — your choice at checkout. Both bottles are sent in their original packaging. The exact shipping cost is shown in the basket.

Frequently asked questions

6 questions

6 key questions

When should you reach for this test?

Why wait 15 minutes before reading?

Why is the marine scale a separate one?

Because salt suppresses the colour reaction. The same copper concentration produces a paler shade in saltwater than in freshwater, and reading a reef tank against a freshwater scale would return a falsely low value.

The colour chart in the kit therefore carries two sets of graduations. Use the one that corresponds to the tank you have just sampled, not the one you tested the previous week.

How do you remove copper from water?

My reading exceeds the last graduation — what should I do?

Dilute the sample with distilled water, repeat the measurement, then multiply the result by the corresponding factor.

Sample	Distilled water	Factor
2.5 ml	2.5 ml	× 2
1 ml	4 ml	× 5
0.5 ml	4.5 ml	× 10

Are these two bottles safe to store near the tank?

Only reagent 2 is classified, with the Warning label and hazard statements H226 and H319: flammable liquid and causes serious eye irritation.

The key point for storage is flammability: keep the box away from any heat source or naked flame, and never place it on top of a lighting unit.

The caps are child-resistant and should be screwed back on fully. An empty bottle should be taken to a household waste recycling centre with other household chemicals.

Let us talk about your project

A question about this product or your setup? Our team will answer and advise you.

Email us Contact form

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.

After-sales service 7 days a week by email or chat

Our team answers all your questions.

Shop responsibly

Become part of the change.

Reagent refill for copper Cu test

The summary