Diy magnesium reference solution

[ReefOnTheBayou]

Is there a diy magnesium reference solution recipe out there? My tank magnesium was lower then I like at 1200. I dose AFR and kalk. I suspected the salt and it also was 1200 (reef crystals). After rasing it 100ppm over a couple days I noticed my salifert test kit was made on Sept 2022. I don't have the original box but I now suspect it could be test error. I ordered a new test kit but I would love to make a solution to see if the old test kit is off. Thanks

 

[rishma]

Is there a diy magnesium reference solution recipe out there? My tank magnesium was lower then I like at 1200. I dose AFR and kalk. I suspected the salt and it also was 1200 (reef crystals). After rasing it 100ppm over a couple days I noticed my salifert test kit was made on Sept 2022. I don't have the original box but I now suspect it could be test error. I ordered a new test kit but I would love to make a solution to see if the old test kit is off. Thanks

The best idea for this I have seen was keeping a sample of tank water when an ICP is done.

Many of us actually don’t test magnesium at all due to test inaccuracies. We use the method in the thread below.

https://www.reef2reef.com/threads/just-say-no-to-magnesium-testing-rmm-is-born.1017528/

 

[Randy Holmes-Farley Verified Community Expert]

That’s my recommendation. It is otherwise difficult to ensure that the magnesium is exactly as intended and it is not going to be in the presence of other ions that might be important. For example, it is important how well the kit distinguishes magnesium from calcium, and if there is no calcium in the standard, it’s not fully validating the kit result for use in seawater.,

 

[ReefOnTheBayou]

Thanks Randy. I always value your input!