Reagent refill for total hardness GH test
Regular price
Dhs. 25.00
Regular price
Sale price
Dhs. 25.00
Unit price
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per
This bottle is the titration reagent for the total hardness test, sold separately. It measures the calcium and magnesium in your water as a single value.
Add it drop by drop to 5 ml of water until it changes from red to green, with each drop equal to 1 °dGH. The test tube in your kit stays in use.
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The summary
- What it measures: total hardness, calcium and magnesium combined.
- What the box contains: 1 bottle of reagent, which titrates total hardness drop by drop.
- How to read the result: you count the drops until the colour changes from red to green.
- Getting more precise: on 10 ml, one drop is worth only 0.5 °dGH.
- Storage: bottle screwed back on, away from any flame; titration is done over a sink, never in the fish water.
- Which waters: freshwater and garden ponds, not seawater.
The titration bottle on its own, one drop equals 1 °dGH, calcium and magnesium combined
A refill for the GH total hardness drop test, this titration bottle measures calcium and magnesium together, at one drop per °dGH in 5 ml of water, in freshwater tanks and in ponds alike. Keep the graduated test tube from the original kit. The sealed bottle keeps for 2 years, and its contents must never go into the fish's water.
Total hardness, or GH, is the sum of the calcium and magnesium salts dissolved in your water. This bottle is the titration reagent alone for the GH drop test, and it is used with the graduated test tube in your kit, for fresh water and the garden pond.
Fill the 5 ml test tube with water, then add the reagent drop by drop, swirling after each drop, until the colour changes from red to green. The number of drops gives the total hardness in German degrees, which also equals 1.25 English degrees and 1.78 French degrees per drop. The colour change is immediate, so there is no waiting time, and the whole test takes just a few minutes.
The GH reagent turns from red to green
The colour change in this bottle is the reverse of that for carbonate hardness, which goes from blue to orange-yellow. Mistaking one bottle for the other gives a drop count that looks plausible yet is wrong, so read the label before each series and store the two reagents in separate boxes.
📐 Reading to the half degree
In soft water, or in reverse osmosis water that you are remineralising, one degree per drop remains a rough reading. Take 10 ml instead of 5: each drop is then worth only 0.5 °dGH, and you halve the total. The first drops colour a double volume less distinctly, so stand the test tube on a white surface to see the colour change clearly. This adjustment is mainly useful when you are fine-tuning water with small successive additions and checking after each one.
🌾 Calcium and magnesium for your crops
Most freshwater fish and plants do well between 8 and 25 dGH. A garden pond often shows a lower hardness, because rain dilutes its water over the seasons. In aquaponics, this value indicates the calcium and magnesium available to your crops, and calcium is one of the elements that fish feed covers poorly; Epsom salt raises only the magnesium portion, without affecting the carbonates. The guide to deficiencies in aquaponics shows how these shortfalls appear on the leaves.
Measure magnesium separately from calcium
The GH titration gives the sum of calcium and magnesium, without telling you which of the two dominates. The magnesium test measures the second share on its own, and the difference between the two results tells you about the calcium. You then know whether your plants are short of magnesium even though the total hardness looks fine.
📦 Storing the bottle
The reagent is classified Warning, with the hazard statements H226, H315 and H319: flammable liquid, skin irritation and serious eye irritation. Store it tightly closed, in a dry place, at room temperature and in its original packaging, away from any flame. As each measurement uses as many drops as the water has degrees, water at 8 °dGH uses up the bottle twice as slowly as water at 16 °dGH, and the liquid level remains your best guide for reordering.
Unopened, the bottle keeps for 2 years; once opened, it ages faster through contact with the air. The reagent is used with the graduated test tube from your total hardness drop test, and the titrated sample is poured down the sink, since the reagent must never go into the fish water.
Technical specifications
What the refill contains
- Contents
- 1 bottle of reagentGH titration reagent, child-resistant cap
- Value of one drop
- 1 °dGH per 5 mlOn 10 ml, one drop is only worth 0.5 °dGH
- Manufacturer's reference
- JBL 2410900, PROAQUATEST rangeNot to be confused with 2410800, which is the complete kit
- Matching test
- Total hardness GH testRef. 2410800, whose graduated test tube remains in service
Reading the total hardness
- Equivalences
- 1.78 °fH, 1.25 °eTap water analyses are expressed in French degrees
- Colour change
- From red to greenThe opposite of the carbonate hardness reagent, whose colour change goes from blue to orange-yellow
Hazard labelling
- Signal word
- WarningSingle bottle, with a child-resistant cap
- Pictograms
- Flame and exclamation mark
- Hazard statements
- H226, H315, H319Flammable liquid, skin irritation and serious eye irritation
- Precautionary statements
- P101, P102, P303+P361+P353, P305+P351+P338, P501
- Precautions
- Sink, ventilated room, out of reachTriethanolamine and ethanol declared
- Storage
- 2 years, bottle unopenedOnce opened, the reagent ages faster through contact with air
To allow for in addition
- Graduated measuring cylinder
- The one for the total hardness testFilled to 5 ml, or to 10 ml so that one drop equals 0.5 °dGH
- What you need to remineralise
- Mineral salts, or Epsom saltThe former measure the total hardness, the latter only the magnesium share
6 further specifications are available in the detailed view.
In the box
- 1 bottle of GH titration reagent, with child-resistant cap
Manufacturer's values (GH test instructions, safety data sheet and FAQ). The number of tests per bottle depends on the hardness of the water being analysed, since each test uses as many drops as the water has degrees.
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 GH bottle on its own, or the complete kit?
Both boxes titrate with the same reagent, from red to green. Only the graduated test tube sets them apart.
Counting accurately takes an accurate volume
One drop equals 1 °dGH per 5 ml: without a graduated test tube, the count means nothing.
| Titration bottles (bottle) | Graduated test tube from 5 to 20 ml | Price | |
|---|---|---|---|
| Recommended Reagent refill for total hardness GH testYour choice | 1 bottle | No | Dhs. 25.00 |
| GH water test, total hardness, drop-basedYour choice | 1 bottle | Yes | Dhs. 42.00 |
Reagent refill for total hardness GH testRecommended
What runs out
Titration bottles (bottle)1 bottle
What keeps
Graduated test tube from 5 to 20 mlNo
Budget
GH water test, total hardness, drop-based
What runs out
Titration bottles (bottle)1 bottle
What keeps
Graduated test tube from 5 to 20 mlYes
Budget
Contents of the two boxes according to the leaflet of the total hardness test.
Buying guide
Buy the GH reagent again, or the whole test
Documents & manuals
Official manufacturer's instructions, in French
The four-step titration test protocol, reference volume and equivalences between German, English and French degrees. This is the kit's instruction leaflet, and it applies to the refill as well.
Document not showing? Some publishers block display inside a frame, so open it in a tab.
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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
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