Blister pack of the JBL PROAQUATEST pH refill, one reagent bottle, on a white background

JBL PROAQUATEST pH reagent refill in blister pack, seen from three-quarter view

Reagent refill for pH test, three ranges

Name: Reagent refill for pH test, three ranges
Brand: JBL
SKU: J2410200
Price: 7.0 USD
Availability: InStock

$7.00

This bottle is the reagent for the pH test, sold separately. Use the selector to choose the range of your test kit, 3.0 to 10.0, 6.0 to 7.6, or 7.4 to 9.0, as it is the colour chart that interprets the result you obtain: approximately 50 readings on the wide range, 80 on the narrow range.

Ref. J2410200·Reagent refill

Model : Ph 3.0 to 10.0

pH 3.0 to 10.0

pH 6.0 to 7.6

pH 7.4 to 9.0

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The summary

What it measures: pH, the acidity or alkalinity of your water.
What is in the box: 1 bottle of reagent.
How many tests: around 50 in the wide range, 80 in the fine range.
Which range to choose: the one in your kit, since the reagent is read against the colour chart for that range.
After reading: the coloured sample is poured down the sink, as this reagent must never go into the fish water.
The matching test: carbonate hardness, which determines pH stability.

The reagent bottle on its own, 50 to 80 tests depending on the range selected

This reagent bottle replaces the one in your pH drop test, in the same range: 3.0 to 10.0, 6.0 to 7.6 or 7.4 to 9.0. It gives about 50 measurements in the wide range and 80 in the narrow range, using the test tube and colour chart you already have. After reading, the coloured sample goes down the sink, never into the fish water.

pH indicates whether your water is acidic or alkaline, on a logarithmic scale where a difference of one unit corresponds to a factor of 10 in actual acidity. This bottle is the reagent alone for the drop-based pH test, offered in three ranges: the wide range from 3.0 to 10.0, and the two narrow ranges from 6.0 to 7.6 and from 7.4 to 9.0. It replaces the empty bottle in your kit.

🎯 Three ranges, two protocols

The wide range is for a rough check: you fill a test tube with 5 ml, add 5 drops, then read the shade against a white background after 5 minutes, and the bottle covers about 50 measurements. The narrow ranges are read on two test tubes placed in a comparator block, one treated with 4 drops and the other kept as untreated water, which compensates for the water's own tint. The reading is then taken after 3 minutes, and each bottle covers about 80 measurements.

The colour chart in your kit sets the range

Order the refill for the same range as your case, because each colour chart is printed for a single reagent and it is the chart that converts colour into a value. A fine-range reagent read against the wide-range chart, or the other way round, gives a shade with no reliable match. If you no longer know which range you own, look at the values printed on the first and last fields of your colour chart.

🌿 Fish, bacteria and plants

In a system where fish, bacteria and plants share the same water, the pH value matters to all three at once, yet it depends mainly on the carbonate hardness that stabilises it. For this reason, you are better off measuring pH and KH on the same day with the carbonate hardness test, aiming for 6 to 12 °dKH. In a garden pond, the favourable range is between 7.5 and 8.5. The guide to regulating pH in aquaponics explains in which order to correct these two values.

Order the KH reagent along with the pH one

If your carbonate hardness kit has already been started, add the KH test refill to the same order. A pH value that drops from one week to the next can only be interpreted alongside the carbonate hardness taken on the same day, and an empty KH bottle would leave you without that second value. The two refills ship together and fit in the same box.

🔁 Refill, storage and precautions

The number of measurements gives the first guide: around 50 for the wide range, 80 for the narrow ranges. At the recommended rate for a newly set-up tank, that is one measurement a day for the first week and then one a week, the bottle for the wide range will therefore last nearly 10 months. You can also watch the drop itself: hold the bottle vertically, nozzle pointing down and dry on the outside, because a drop that comes out with an air bubble throws off the dose. When the drops become irregular despite this, the bottle is nearly empty and your refill takes over.

Unopened, the reagent keeps for 4 years in the 3.0 to 10.0 range and 3 years in the narrow range; once opened, it deteriorates faster through contact with the air. So note the opening date on the box, and order the refill before a period of frequent measurements. The test tube and the colour chart are the same as those of your pH drop test of the same range, and each coloured sample is poured down the sink, because this reagent never goes into the fish's water.

The reagent is classified Warning, with the hazard statements H226 and H319, as it is a flammable liquid that causes serious eye irritation. For this reason, store the bottle tightly closed, in a dry place at room temperature and in its original packaging, away from any flame. If it splashes into the eye, rinse cautiously with water for several minutes, and keep the box out of the reach of children despite its child-resistant cap.

Technical specifications

What the refill contains

Contents: 1 bottle of reagentpH reagent, child-resistant cap
Readings: Around 50 or 8050 for the wide range, 80 for the 6.0 to 7.6 or 7.4 to 9.0 range
Manufacturer's reference: JBL 2410200, 2410400, 2410600Range 3.0 to 10.0, then 6.0 to 7.6, then 7.4 to 9.0
Matching test: Drop-based pH test, same rangeRef. 2410100, 2410300 or 2410500: each colour chart is printed for its own range

The procedure

Water volume: 5 mlOne wide-range test tube, two test tubes and a fine-range block
Drops and waiting time: 5 drops, 5 min, or 4 drops, 3 minThe first protocol applies to the wide range, the second to the narrow ranges

Hazard labelling

Signal word: WarningThe single bottle is covered, whatever the range
Pictograms: Flame and exclamation mark
Hazard statements: H226, H319Flammable liquid and vapour, causes serious eye irritation
Precautionary statements: P101, P102, P303+P361+P353, P305+P351+P338, P501
Precautions: Away from flame, out of reachDosed sample poured down the sink
Storage: 3 to 4 years, bottle unopened4 years for the 3.0 to 10.0 range, 3 years for the fine range; an opened bottle wears out faster

To allow for in addition

Test tube and colour chart: Those from the pH testThe colour chart is printed for a given range, and it is this that translates the colour into a value
The test that goes with it: A carbonate hardness testBelow 5 °dKH, your pH loses its stability

6 further specifications are available in the detailed view.

In the box

1 bottle of pH reagent, with child-resistant cap

Manufacturer's values (pH test instructions, safety data sheets and FAQ). The 5 °dKH benchmark comes from the carbonate hardness test instructions.

Manufacturer and product safety

Manufacturer: JBL GmbH & Co. KG
Postal address: Dieselstraße 3, 67141 Neuhofen, Allemagne
Contact: info@jbl.de
Website: www.jbl.de

Information provided under Regulation (EU) 2023/988 on general product safety.

The bottle on its own, or the pH kit?

The reagent is the same in both boxes. The kit adds the colour chart for the chosen range and the glassware, which you may already have.

A pH bottle is read against a precise colour chart Each range has its own printed colour chart. The refill assumes that you have kept the chart for the same range.

	Reagent bottles (bottle)	Colour chart for the range	Test tube or comparator block	Price
Recommended Reagent refill for pH testYour choice	1 bottle	No	No	$7.00
pH water test in drops, wide or narrow rangeYour choice	1 bottle	Yes	Yes	$12.00

Reagent refill for pH testRecommended

What runs out

Reagent bottles (bottle)1 bottle

What keeps

Colour chart for the rangeNo

Test tube or comparator blockNo

Budget

pH water test in drops, wide or narrow range

What runs out

Reagent bottles (bottle)1 bottle

What keeps

Colour chart for the rangeYes

Test tube or comparator blockYes

Budget

Contents of the two boxes, taken from the manufacturer's pH test instructions.

Estimate your
delivery time

Parcel weighing 0.02 kg, dispatched within 48 h by Colissimo or Chronopost to your home, as you choose during checkout. The bottle is sent in its original packaging. The exact shipping cost is shown in your basket. Once unsealed, this product cannot be returned under the right of withdrawal (article L221-28, 5° of the French Consumer Code), for reasons of hygiene and health protection.

Frequently asked questions

6 questions

6 key questions

Which range should I choose on the selector?

Go by the one in your kit, since the colour chart you own is printed for a single reagent and it is the chart that converts the colour obtained into a value.

Range	Use	Measurements
3.0 to 10.0	General check, freshwater, seawater and pond	approx. 50
6.0 to 7.6	Fine monitoring of slightly acidic or neutral freshwater	approx. 80
7.4 to 9.0	Fine monitoring of seawater, a pond or alkaline water	approx. 80

If in doubt, read the values printed on the first and last fields of your colour chart.

How long should you wait before reading?

Can you measure water stained by peat?

Yes, with a fine range. The 6.0 to 7.6 and 7.4 to 9.0 refills are read using two test tubes, one of which contains untreated water: placed in the comparator block, it compensates for the water's own tint, whether that comes from peat filtration or from a treatment.

The wide range is read using a single test tube, against a white background, and remains an indicative check. On clearly coloured water, its reading is less reliable.

What does a logarithmic scale mean?

Where should you take the water from for an accurate measurement?

Take the sample from mid-depth, never just below the surface.
Take it well away from an inlet, an air diffuser or a filter outlet.
Always sample from the same spot and at the same time of day, so that two readings can be compared.
Use a test tube rinsed with this same water before sampling.

The tested sample is then poured down the sink: the pH reagent must never go back into the fish water, even in small amounts.

My pH is dropping on its own, what should I do?

Look at carbonate hardness first. Water that has almost no carbonates left no longer neutralises the acids produced by life in the tank, and its pH drops without you having done anything.

Correcting the pH of water with no buffering reserve is only ever temporary. So raise the alkalinity to at least 5 °dKH, let the water stabilise for 24 hours, then repeat this measurement: the pH will often have stabilised by itself.

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Reagent refill for pH test, three ranges

The summary