Home CHEMISTRY Elos Test kit: KH alkalinity

Elos Test kit: KH alkalinity


elos test carbonati kh

I started talking about Elos test kits since 2007, when I used Salifert that didn’t satisfied me, then I spoke again last year when I used them as a measure of comparison with the OceanLife test kit, today, thanks to the purchase of the entire Elos test kit, as I do about every 6 months, I’m here to speak about them. Let’s start with the Elos Test of Alkalinity or KH.

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As you can see from the photo, the test kit consists of a good-sized box that contains the folding paper with explanations, the leaflet, one glass tube with Elos symbol and its plastic cap, a small bottle containing the liquid reagent called KH and a syringe.

The reagent and the tube are contained inside a plastic bag.

Unfortunately, when they thought about the box, they did it slightly too low, so the reagent bottle, which in this case is only one, can’t stay standing but must be inserted horizontally.

The test is, in any case, very very simple.

It fills the tube with 5 ml of aquarium water with the excellent syringe provided.

elos test carbonati kh

2014_03_elos_test_kit_001You need to add a drop of reagent from the KH bottle in the test vial.

You swirl the tube gently for 30 seconds and observe whether there has been a change in color.

If there were no changes in the color, you have to repeat the previous two steps until the color change has occurred towards orange/yellow from blue/cyan.

At that point, the number of drops corresponds to the KH value of our water divided by two. I.e. 16 drops would correspond to 8 KH, and so on. Every drop in fact is equal to 0.5 KH.

Obviously it is always possible to vary the amount of water in the tube to obtain a greater or lesser resolution. Using 10 ml of aquarium water , instead of 5 ml recommended by Elos, every drop of the reagent will be equivalent to 0.25 KH, whereas decreasing the water in the tube at 2.5 ml, each drop would be equal to 1 KH, and using only 1 ml of aquarium water you will have 1 drop for 2.5 KH, useful to get an idea of the value inside calcium reactor, for example, without finishing the reagent.

This is the leaflet.

elos test carbonati kh

One of the things I like to mark is the dropper of the bottle, that is extremely accurate, and the drops are almost always identical to themselves. Elos claims to use a calibrated dropper, thing we can not verify, but, in any case, the result is great. Of course, sometime it might happen that a drop is filled by air and bangs, but my experience shows me a chance lesser than one drop for every box… I advise you to swirl the bottle before using the reagent.

elos test carbonati kh

In the back of the box you can read the reagents used, then also listed in the leaflet with instructions for use.

Elos fits the expiration date stamped with the date by which you should open the test, useful to understand if the test kit is good or not.

elos test carbonati kh

The test is fairly inexpensive since it costs 12,57 €. And, given my experience over time, I can also say that the results have always been in line with what is present in the aquarium, given the many comparisons I’ve done with other tests.

I did not detect any significant difference between this test kit and those I’ve used in the past, similar colors and absolutely comparable readings as usual.

Below you can watch the video, made by the same Elos, that shows how to make the measurement of KH using his test:

Do remember that all tests, although they have a high number of measurements, should be used not after than six months from their first use. Incorrect storage can ruin the reagents and give you false readings.

I recommend you always use your eye to evaluate the aquarium, do not rely only to test, and if the tests were to detect a value clearly wrong, before making any countermeasure would be desirable to do it again with other brands deemed reliable. Of course, an eye should check the expiration date, which is essential for such  perishable reagents, especially if exposed to moisture and heat.

In addition to calibrated dropper, that for a titration test is absolutely critical, the mode of packaging and conservation are fundamental for right readings.

Finally you can download the instruction manual here: Elos Test Kit KH manual

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Ingegnere Idraulico, comincia a scrivere su DaniReef nel 2007, sviluppandolo in italiano ed in inglese, attualmente scrive per il blog americano Reefs.com e la rivista tedesca Koralle Magazin ed ha pubblicato il suo primo libro Acquario Marino qualche anno fa - Danilo is Hydraulic Engineer, began to write on DaniReef in 2007, developing it in Italian and English, currently writes for Reefs.com and the German magazine Koralle Magazin and has published his first italian book Marine Aquarium some year ago.