Calcium-magnesium

[AgMa]

Hi,


I do 50% water change every Sunday from 100% R/O water. I replenish the water with calcium (15ppm), magnesium (5ppm) and bicarbonate soda. My question is:


Do I have to add only the quantity just for the water I change or for the whole tank?


The clean water, must have also 15ppm ca and 5ppm mg or the half?

 

[Christophe]

For water hardness elements, add only for the new replacement water. Generally very little of these elements are depleted. The leftover water in the tank will still have plenty.

 

[Dennis Singh]

~~^^^^^^^


agreed with

 

[AgMa]

Thanks a lot

 

[AgMa]

Another question. Why I have the same gh (6) then like first day?


I thought that gh would be high because till now I was dosing ca-mg accordingly the whole tank, not just for the water change.

 

[nicpapa]

Because plants not need a lot for growing .


Ca ,mg ,fe ,mg ,adjust the gh...

 

[AgMa]

I mean that if I'm doing wrong with this dosage (from what you say, I have to replace ca-mg only for the new replacement water while I was replacing for the whole tank) then why gh is the same?


I think that it had to be increased. Am I wrong?