[vanostav61]

Hi guys, the PPS PRO Macros recipe includes 20.2 grams of MgSO4.
Do I need the Magnesium if my tap water is hard?
My GH is 7 and KH is 7 too. Also, according to my tap water report there is an average of 20ppm Ca and 10ppm of Mg in my tap water. I do weekly 50% water changes.

 

[Immortal1]

If you water is 20ca and 10mg, then I would say no - you don't need additional MgSo4. My RO system is currently getting 5ppm Mg added with another 1.5ppm Mg from the MgNo3 added as part of the macros.
I would say the 10ppm Mg that you have would be plenty.

 

[vanostav61]

If you water is 20ca and 10mg, then I would say no - you don't need additional MgSo4. My RO system is currently getting 5ppm Mg added with another 1.5ppm Mg from the MgNo3 added as part of the macros.
I would say the 10ppm Mg that you have would be plenty.

Thank you, I am about to mix a new batch and won't be adding Mg anymore.