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: 61.0 USD
Availability: InStock

$61.00

$20.33 × 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.

Water test

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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.

The JBL PROAQUATEST 6 in 1 water analysis case is used to monitor the water of a pond or an aquaponic system with six drop tests: pH, KH, GH, ammonium, nitrite and phosphate. KH is read in 2 minutes, ammonium in 17 minutes, waiting time included. Everything fits in a watertight case, and the reagents can be bought individually.

Pond water can stay clear even though its ammonium or nitrite level has already risen. This kit brings together the six measurements that let you detect these deviations before they show up in the fish's behaviour, with drop reagents, test tubes and colour charts. Everything fits in a water-resistant case, which lets you work at the pond's edge rather than carrying samples back to the kitchen.

💧 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 water's buffering capacity, that is, its ability to neutralise acids without the pH shifting, and it falls on its own 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 adjusting the pH always starts with a drop count on carbonate hardness.

The other five tests are grouped according to what they monitor. The pH reads from 3.0 to 10.0 across 14 colour fields, and it determines how much of the ammoniacal nitrogen is present as toxic ammonia. Total hardness is counted in drops, like KH, at one drop per 1 German degree in 5 ml of water, with no colour chart to compare against. Ammonium and nitrite are the two dangerous values in the nitrogen cycle: nitrite reads from 0.025 to 1 mg/L, and its target remains zero. Lastly, phosphate feeds algae as much as plants, and this kit measures it in the koi version, designed for high concentrations.

Rinse, take the sample and read it in daylight

Read your colour charts in daylight and never under warm lighting, because the pinks and oranges of the nitrite test shift under it. Rinse the test tube several times with pond water before filling it, as each instruction leaflet requires, so that no residue from a previous test mixes with the sample. Finally, take the sample from the middle of the water volume, never just below the surface or against the bottom. Several reagents are classified as hazardous: those for KH and nitrite cause severe skin burns and eye damage (H314, H318), and ammonium reagent 3 is highly flammable (H225). Work over a sink, wearing gloves and well away from any flame, and empty the used test tubes down the sink, never into the pond.

🌿 Water shared with plants

As soon as crops draw on the same water as your fish, two of these six figures change meaning. Phosphate stops being a mere indicator of algae and becomes a feed ration, since your plants take it up: a level that drops in mid-season therefore signals crops short of phosphorus rather than clean water. Total hardness, for its part, tells you about the calcium and magnesium the leaves need. Ammonium and nitrite, by contrast, keep the role they have 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 the article on the nitrogen cycle in aquaponics.

Binding dissolved phosphorus when phosphate levels remain high.

A phosphate level that stays high sets algae growing again with every hot spell. The anti-phosphate treatment for ponds binds the dissolved phosphorus, and you check its effect on the next reading. You then correct based on a dated figure rather than the colour of the water, and you know 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, fed pond. It covers precisely the situation in which phosphate becomes a problem, that of water turning green in spring or a heavily stocked koi pond, and the comparator block compensates for the water's own tint. To follow traces of phosphate in clear water, or to fine-tune the balance between your crops and the algae, the Sensitive version reads low concentrations: it is included, alongside the koi version, in the 10-in-1 pond test case.

🧰 What gets used up, what remains

Only the reagents are consumed. The case, the test tubes, the syringe, the measuring scoop, the comparator block and the colour charts stay with you from one season to the next, and almost all the reagents can be bought again as a refill sold on its own. Your first purchase is therefore the equipment, and later ones cover only the bottles you have actually emptied. The nitrite and ammonium reagents run out first, because these two tests are 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.

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.

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	$61.00
10-in-1 water analysis kit for pondsYour choice	10 tests	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	$137.00
Pack of 5 aquaponics water tests: NH4, NO2, NO3, pH, KHYour choice	5 tests	Yes	Yes	No	No	No	No	No	No	No	Yes	$73.00

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

Kit dispatched sealed within 48 hours, reagents in their original compartments, by Colissimo or Chronopost home delivery, as you choose at checkout. The exact cost is shown in your basket once you have entered your address. 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

8 questions

6 key questions, 8 in the detailed view

Does this kit measure nitrate?

No, 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 from the pond water, because it measures their nitrogen ration.

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

When refilling the pond in spring, check the ammonium and nitrite twice a week until both return to zero.
In mid-season, a full set of readings every 2 weeks is enough on an established pond.
During a heatwave, step up the checks on ammonium, whose toxic fraction increases with pH and temperature.
After an event, check the nitrite within 48 hours of adding fish, cleaning a filter 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 °dKHper drop, in 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 decline even further.

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?