Calcium 780/795

[KrisReef]

Interesting thread. Thought the OP must be mixing cement to get that much calcium

Thanks for the updates!

 

[Pager880]

I personally think it is unlikely to be this high, but if it is, it will not come down without adding tons of alkalinity over time. A drop of 200 ppm calcium will take up more than 28 dKH of alk.

So wont come down buy its self. As alkalinity sits around 9.dkh mag sits around 1400+ cant remember last time i did water change. Probably well over 1/2 years. Iv tested with salifert and a brand new aquaforest pro. both says same give of take in the region. So must be accurate i have no precipitation no powdery wite stuff anywhere. I got sps growing fine. Tank looks fine.

 

[Randy Holmes-Farley Verified Community Expert]

So wont come down buy its self. As alkalinity sits around 9.dkh mag sits around 1400+ cant remember last time i did water change. Probably well over 1/2 years. Iv tested with salifert and a brand new aquaforest pro. both says same give of take in the region. So must be accurate i have no precipitation no powdery wite stuff anywhere. I got sps growing fine. Tank looks fine.

Unless you’ve done tests not listed, or I missed/misunderstood them, I don’t see anything supporting a 750 ppm result except the low resolution Salifert that gets multiplied up and has more error.

The other two just say over 500 ppm, which is not that unusual.

Forget the low resolution tests. Use both normal tests and just add a second syringe of titrant to get to the color change. Then add the two values together to get an actual number.

Do the same in your new salt water (if needed).

 

[Pager880]

Unless you’ve done tests not listed, or I missed/misunderstood them, I don’t see anything supporting a 750 ppm result except the low resolution Salifert that gets multiplied up and has more error.

The other two just say over 500 ppm, which is not that unusual.

Forget the low resolution tests. Use both normal tests and just add a second syringe of titrant to get to the color change. Then add the two values together to get an actual number.

Do the same in your new salt water (if needed).

Yes im having to do the lower resolution in both test kits. And double the reading..... As in the normal method thay both bottom out at 500ppm and i get no colour change. So i no its got to be ubove 500ppm so thats why im doing the lower resolution. Hope u can now understand.