Closed JBL ProAquaTest Combiset Pond analysis case, with pH, KH, GH, NH4, NO2 and PO4 tests on the lid

Measuring ammonium with a JBL ProAquaTest kit, test tubes placed on the colour chart alongside the reagent bottles

JBL ProAquaTest CombiSet colour comparator chart – nitrogen cycle parameter readings for aquariums

6-in-1 pond water analysis kit

Name: 6-in-1 pond water analysis kit
Brand: JBL
Price: 52.9 EUR
Availability: InStock

52,90 €

17,63 € × 3 with no fees Klarna.

This JBL PROAQUATEST kit brings together six drop tests for pond or aquaponic system water: pH, KH, GH, ammonium, nitrite, and phosphate. Reagents, glassware, and the colour comparison block all fit into a watertight case, and reagents can be repurchased individually.

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The summary

What you receive: the waterproof carry case, the reagents for all six tests, the glassware, the syringe, the measuring spoon and the colour comparator block.
What you measure: pH, KH, GH, ammonium, nitrite and phosphate, all using drops.
How long it takes: 2 minutes for carbonate hardness, 17 minutes for ammonium, waiting time included.
How to choose: this kit is suited to a stocked ornamental pond, from the spring refill through to autumn.
What runs out: the reagents only, nearly all available as separately sold refills.
What's dispatched to you: the sealed case, reagents in their original compartments.

Six drop tests covering toxic nitrogen, mineral buffering, and phosphates.

Pond water can remain clear even when ammonia or nitrite levels have already risen. This test kit brings together the six measurements needed to detect these changes before they affect fish behaviour, using liquid reagents, test tubes, and colour charts. Everything fits into a water-resistant case, so you can work at the pond's edge rather than carrying samples indoors.

💧 Six readings for a pond

Of the six values in the test kit, KH is the one on which pH stability depends. It measures the buffering capacity of the water, that is, its ability to neutralise acids without the pH shifting, and it falls naturally because nitrification consumes alkalinity. Below 5 °dKH, the pH can drop sharply overnight, which also slows the activity of the bacteria in the biofilter. That is why pH adjustment always begins with a drop count for carbonate hardness.

It reads from 3.0 to 10.0 across 14 colour fields, and it determines the proportion of ammoniacal nitrogen present as toxic ammonia.

KH and GH

Both hardnesses are counted in drops. One drop equals 1 German degree per 5 ml of water, with no colour chart to compare against.

Ammonium and nitrite

These are the two dangerous values in the nitrogen cycle. Nitrite is read from 0.025 to 1 mg/L, and its target remains zero.

Phosphate

It feeds algae just as readily as plants, and this kit measures it in a koi version, designed for high concentrations. It's the first figure to check when the water turns green.

Evening light distorts the colours

Read your colour charts in daylight and never under warm artificial light, as the pinks and oranges of nitrite shift under those conditions. Rinse the test tube several times with pond water before filling it, as each instruction leaflet requires, so that no residue from a previous measurement contaminates the sample. Finally, take your reading from the middle of the water column, never just below the surface or against the bottom.

🌿 Water shared with plants

As soon as crops draw from the same water as your fish, two of these six figures change their meaning. Phosphate is no longer simply an algae indicator but becomes a nutrient ration, since your plants are taking it up: a level that drops during the growing season points to crops short of phosphorus rather than to clean water. Total hardness, meanwhile, gives an indication of the calcium and magnesium that leaves require. Ammonium and nitrite, on the other hand, retain the same role they play in any ornamental pond, and they remain the two values to keep as low as possible for the fish. The full sequence is described in our article on the nitrogen cycle in aquaponics.

Binding dissolved phosphorus when phosphate levels remain high.

A persistently high phosphate level triggers algal growth with every warm spell, and measurement alone will not bring it down. The anti-phosphate pond treatment binds dissolved phosphorus, and you can verify its effect on the next reading. You then make corrections based on a dated figure rather than the colour of the water, and you know exactly when to stop dosing.

🟢 A phosphate test for a heavily stocked pond

The phosphate test in this kit is the koi version, designed for the high levels found in a stocked and fed pond. It covers precisely the situation where phosphate becomes a problem, water turning green in spring or a heavily stocked koi pond, and the colour comparator compensates for the natural tint of the water. To track trace levels of phosphate in clear water, or to fine-tune the balance between your plants and algae, the Sensitive version reads low concentrations: it comes together with the koi version in the 10-in-1 pond test kit.

🧰 What gets used up, what remains

Only the reagents are consumed. The kit, the test tubes, the syringe, the measuring spoon, the comparator block and the colour charts stay with you from one season to the next, and almost all the reagents are available as separately sold refills. Your first purchase covers the equipment, and subsequent ones only concern the bottles you've actually emptied. The nitrite and ammonium reagents run out first, as these two tests need to be repeated after every incident.

Technical specifications

The essentials

Parameters measured: pH, KH, GH, NH4, NO2, PO4Six drop-based tests, no instrument to calibrate
Method: Liquid reagents, colorimetric readingThe supplied comparator block accounts for the natural colour of the water at the time of the reading
Covered water: Garden pond, spring, well, tapUseful before a top-up, to find out what the make-up water brings to the pond.
Manufacturer's reference: JBL 2407000, PROAQUATEST rangeCode EAN 4014162240705
Bottle safety: Child-resistant capsThe case itself is water-resistant and closes securely
What needs replacing: Reagents onlyAlmost all are available as refills: the glassware and colour charts keep well

The six tests, one by one

pH: Wide range, 3.0 to 10.014 colour fields, in steps of 0.5 above pH 4.0
KH, carbonate hardness: Titration, 1 drop = 1 °dKHUsing 5 ml of water. At least 5 °dKH in a pond to keep the pH stable.
GH, total hardness: Titration, 1 drop = 1 °dGHAlso on 5 ml of water. The colour shift goes from red to green, the opposite of the carbonate hardness test
NH4 and NH3, ammonium: Colorimetric, using 3 reagentsThe genuinely toxic fraction of ammonia is derived from a table cross-referencing pH and temperature
NO2, nitrites: 0.025 to 1 mg/LThe target is zero. No readable value is acceptable for fish
PO4, phosphates: Koi version, elevated levelsWith reference test tube. Nutrient taken up by both algae and plants

The technique and the timing

Water volume per test: 5 or 10 mlSamples drawn with a sampling syringe, from mid-depth, never just below the surface.
Waiting time: 0 to 15 minutesNone for KH and GH, 5 minutes for nitrite, 10 for phosphate, 15 for ammonium
The steps: Rinse, fill, dose, shake, wait, readIn this order, shaking after each reagent added
Reading: Colour chart, in daylightA warm artificial light shifts the perception of pink and orange shades

To budget for separately

The nitrate: A nitrate NO3 testThis is the nitrogen taken up by crops, and it needs to be monitored separately.
Reagent refills: Reagents sold individuallyGlassware, sampling syringe, measuring spoon, comparison block, and colour charts can all be stored.

10 further specifications are available in the detailed view.

In the box

1 water-resistant plastic case
The reagents for the 6 tests, in child-resistant cap bottles
Glass test tubes
1 sampling syringe
1 measuring spoon
1 laboratory comparator block
1 set of colour charts

Parameters, box contents, reference and EAN code taken from the official JBL PROAQUATEST COMBISET POND datasheet on 20/09/2026. Ranges, protocols and waiting times taken test by test from the instructions of the same tests sold individually.

Six tests, ten tests or five boxes?

All three use the same drop reagents and the same colour comparator block. What sets them apart is the range of parameters they cover and how you restock what runs out.

This kit covers toxicity, buffering capacity, and phosphates It measures pH, KH, GH, ammonium, nitrite and phosphate. Answer two questions and the table will identify the format that suits you.

	Drop tests (tests)	pH, KH, ammonium and nitrite	NO3, nitrates	GH, total hardness	PO4, phosphates	O2, dissolved oxygen	pH, narrow range of 7.4 to 9.0	PO4 at high concentration, koi version	Single kit with comparison block	Thermometer included	Each parameter in its own box	Price
Recommended 6-in-1 kitYour choice	6 tests	Yes	No	Yes	Yes	No	No	Yes	Yes	No	No	52,90 €
10-in-1 water analysis kit for pondsYour choice	10 tests	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	119,90 €
Pack of 5 aquaponics water tests: NH4, NO2, NO3, pH, KHYour choice	5 tests	Yes	Yes	No	No	No	No	No	No	No	Yes	63,90 €

6-in-1 kitRecommended

What you're measuring

Drop tests (tests)6 tests

pH, KH, ammonium and nitriteYes

NO3, nitratesNo

GH, total hardnessYes

PO4, phosphatesYes

O2, dissolved oxygenNo

pH, narrow range of 7.4 to 9.0No

PO4 at high concentration, koi versionYes

The form and restocking

Single kit with comparison blockYes

Thermometer includedNo

Each parameter in its own boxNo

Price

10-in-1 water analysis kit for ponds

What you're measuring

Drop tests (tests)10 tests

pH, KH, ammonium and nitriteYes

NO3, nitratesYes

GH, total hardnessYes

PO4, phosphatesYes

O2, dissolved oxygenYes

pH, narrow range of 7.4 to 9.0Yes

PO4 at high concentration, koi versionYes

The form and restocking

Single kit with comparison blockYes

Thermometer includedYes

Each parameter in its own boxNo

Price

Pack of 5 aquaponics water tests: NH4, NO2, NO3, pH, KH

What you're measuring

Drop tests (tests)5 tests

pH, KH, ammonium and nitriteYes

NO3, nitratesYes

GH, total hardnessNo

PO4, phosphatesNo

O2, dissolved oxygenNo

pH, narrow range of 7.4 to 9.0No

PO4 at high concentration, koi versionNo

The form and restocking

Single kit with comparison blockNo

Thermometer includedNo

Each parameter in its own boxYes

Price

Parameters, contents and references of the three test kits sourced from the official JBL PROAQUATEST datasheets on 20/09/2026, then cross-checked test by test against the instructions for the same tests sold individually.

Estimate your
delivery time

Set dispatched closed within 48 hours, reagents in their original compartments, by Colissimo or Chronopost home delivery, your choice at checkout. The exact cost is shown in the basket once you have entered your address.

Frequently asked questions

8 questions

6 key questions, 8 in the detailed view

Does this kit measure nitrate?

The kit does not include a nitrate test. It covers pH, carbonate hardness, total hardness, ammonium, nitrite and phosphate, that is, the dangerous part of the nitrogen cycle and the mineral chemistry of the water.

Nitrate is monitored with the NO3 nitrate test, which reads from 0.5 to 200 mg/L. It becomes useful as soon as plants draw on the pond water, because it measures their nitrogen supply.

How often should you test the water in a garden pond?

When the pond is refilled in spring, test ammonium and nitrite twice a week until both return to zero.
In the height of the season, a full test every 2 weeks is enough on an established pond.
During a heatwave, tighten up on ammonium, whose toxic share rises with pH and temperature.
After an event, check nitrite within the 48 hours following the addition of fish, a filter clean or a pump failure.

Can you test tap water or well water before filling?

Why does carbonate hardness drop on its own?

5 °dKHthe floor not to go below

1 dropequals 1 °dKH on 5 ml of water

Because nitrification consumes alkalinity: the bacteria that convert ammonium draw on the carbonates in the water. Rain, which contributes none, speeds up the drop even more.

Below the floor, the water has no buffering capacity left and the pH can crash overnight. So count the drops every week rather than once a season.

The water turns green in spring — where do you start?

How long does a full set of six tests take?

Ammonium rises in midsummer — what should you do?

Which tests should you add for an aquaponic system?

Let us talk about your project

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6-in-1 pond water analysis kit

The summary