Magnesium testing

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I’m using the Salifert magnesium testing kit exactly as directed but there is no colour change. My salt adds 1350ppm and I don’t add magnesium. The maximum reading is 1500ppm. Anyone else had this problem?


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Last Edit: Sep 1, 2019 9:33:30 pm by DUSTYBOY272

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Reply #1

Have you checked the date on the test kit?

Never had an issue with mine.
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DUSTYBOY272

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Reply #2

Yup it’s well in date I just bought it this week.


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Reply #3

Could be a bad test kit, or your salt wasn't mixed properly before you added it to the RO (I've done this before 🤦‍♂️).

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DUSTYBOY272

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Reply #4

What was it you were doing wrong?


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ajm83

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Reply #5

What was it you were doing wrong?


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I didn't realise you had to stir the salt in the bucket before you added it to the water.  I guess the contents had separated out due to granular convection (same as why the brazil nuts always rise to the top in bags of mixed nuts!)

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DUSTYBOY272

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Reply #6

Thanks, I wasn’t doing that. It didn’t cross my mind, now you’ve said it it seems obvious .
Really appreciate your reply.

Not too happy with the Salifert customer service. I emailed them directly; the first response was “I don’t know I’ll get a senior staff member to reply”. The senior staff then messaged a week later to say “It means there is no magnesium at all in your aquarium”.

Impossible, I already told them that my salt mix has 1350 ppm and I do a 100litre water change every 2 weeks.


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Last Edit: Sep 9, 2019 11:28:38 am by DUSTYBOY272

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Reply #7

What a weird reply (from Salifert). Maybe try to raise it via social media. It normally gets their attention.
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Reply #8

Probably it's way higher than 1500ppm if there was no hint of colour change at all,  otherwise if it really was zero it would have changed instantly at the first drop of reagent being added?


Dilute the sample by 50% with RO and test it again (so take 1ml of aquarium water and 1ml or RO) and try testing it again. See what that comes in at.

I would also double check your salinity (& the calibration of the device you're using to test it) just in case it's way higher than you thought. 

It's not unusual to have a salt mix which is not quite right either.  I've got a Fluval salt mix in my shed which has high mag,  and IQuatics was too. 

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