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Comparison of Colombo and Salifert Ca, Kh, and Mg test kits

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  • Graeme
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Check out this review to see how the kits are packaged, instructions, etc:
https://reefbase.co.uk/colombo/review-of-colombo-nitrate-and-phosphate-test-kits/
As a recap, they're very user friendly, and easy to use.  The Calcium, Alkalinity, and Magnesium kits are very similar to the Salifert kits.  The colours of the liquids are different, but just as easy to see neutralization point of the titration.

I thought I'd compare the values I got from these with my tried and trusted Salifert kits.  These are the values I got:
Test | Colombo result | Salifert result
Kh | 5.8 | 5.7
Ca | 360 | 350
Mg | 1350 | 1200 (Salifert kit went out of date in Nov'16)

Ignoring that my Kh and Ca are low, the results are very similar.  I'd put differences down to well within user error margins, so I'm very happy to trust the Colombo test kits for these two.

For Mg, my Salifert test kit is slightly out of date, and given that Mg normally doesn't deplete (I've no reason to think it would in my tank), I'm inclined to go with the Colombo result, which is spot on where I'd want Magnesium.

I've not dosed anything to my tank since setting it up in April, so I expected levels to be low (although not that low, as I don't have that many hard corals really).  I've also bought a doser, so going to get that set up and sort my levels out.

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ajm83

  • Andy
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Reply #1

Aside from mag, it's quite surprising how close they are!


Looks like the phosphate test would be quite a lot easier to read than the salifert equivalent too.

HK_Fuey

  • Graeme
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Reply #2

I've never had the Salifert phos test kit, but instead the D-D one.  The colour differences are equally close IMHO.

Carol

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Reply #3

The D&D phos is much more sensitive than the Salifert as ive had both. As far as your mag goes,I let my mag test get too old  and it read on the low side.


Id say pretty good test kits.


Thanks Graeme  :D
Do not mock the snake because it has no horns.For who is to say that one day it may become a dragon,as one just man may become an army...Water Margin.

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bertie1969

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Reply #4

I've never had the Salifert phos test kit, but instead the D-D one.  The colour differences are equally close IMHO.

I registered so that i could ask you a question. Im not a fan of the Colombo nitrate test kit as it has a funny bright pink colour that does not match the chart. I also bought the calcium test kit. I have no idea how to use the tiny spoon, i get 2 very different readings if i use the spoon tip slightly heaped (500ppm) and different if nearly flat with a minimal amount (435ppm). The instructions are not clear and the instruction video on youtube does not show either. What is your take on this.

Also how are you meant to use the small spoons on Salifert test kits, should i level them off with something?

Gav

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Reply #5

I registered so that i could ask you a question. Im not a fan of the Colombo nitrate test kit as it has a funny bright pink colour that does not match the chart. I also bought the calcium test kit. I have no idea how to use the tiny spoon, i get 2 very different readings if i use the spoon tip slightly heaped (500ppm) and different if nearly flat with a minimal amount (435ppm). The instructions are not clear and the instruction video on youtube does not show either. What is your take on this.

Also how are you meant to use the small spoons on Salifert test kits, should i level them off with something?

I normally level off all my test kit spoons , otherwise you'd need to try and replicate the same heap (exactly) for every test which wouldn't make for a very accurate test and would be a PITA to use .

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bertie1969

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Reply #6

I normally level off all my test kit spoons , otherwise you'd need to try and replicate the same heap (exactly) for every test which wouldn't make for a very accurate test and would be a PITA to use .

Thanks for your reply. Sounds like a good way to do it. The instructions never mention levelling the spoon but i shall do it from now on. The problem with the  Colombo spoon is that it is very shallow and it would be tricky to level it off. Have you had to deal with one of these spoons?

Gav

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Reply #7

No not specifically the Colombo spoon , I use salifert test kits , some of the spoons are pretty small and depending on the consistency of the powder can also be a pain to level , I find the grainier type powders more awkward to level as it's easier to knock it off / out of the spoon compared to the finer powders .
I use a small piece of shiny card to level off and scrape the excess from the top but you do have to be quite gentle .

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bertie1969

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Reply #8

No not specifically the Colombo spoon , I use salifert test kits , some of the spoons are pretty small and depending on the consistency of the powder can also be a pain to level , I find the grainier type powders more awkward to level as it's easier to knock it off / out of the spoon compared to the finer powders .
I use a small piece of shiny card to level off and scrape the excess from the top but you do have to be quite gentle .

The salifert spoons are big compared to the colombo one he he. The powder is grainy, the small end of the spoon used is has a shallow slot which might make it tricky to get a definite level. I will give it a try using a card and see how i get on. Cheers ;)

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HK_Fuey

  • Graeme
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Reply #9

@bertie1969 Same as the other guys. I level them off (best I can).

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bertie1969

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Reply #10

@bertie1969 Same as the other guys. I level them off (best I can).

Ok mate many thanks for your reply. Im due to do another test in the next couple of days, ill give the levelling off a try. cheers.

ajm83

  • Andy
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Reply #11

The salifert spoons are big compared to the colombo one he he.

Tell you what though,  either of those beats the seachem copper test, where you have to try and get 'a dusting' of powder onto a plastic stick  lol

bertie1969

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Reply #12

Tell you what though,  either of those beats the seachem copper test, where you have to try and get 'a dusting' of powder onto a plastic stick  lol


Thanks for the tip i will avoid that one ;)

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