High GH - mixing up water question

[jwmachon]

Looking to use 50/50 to water split for tank

My tap water is
GH 18
KH 7

If I do a straight 50/50 mix apart from obviously warming the water do I need to prepare the ro water in any other way or just mix them both

Thanks

 

[bazz]

Yes just mix and leave for a couple of hours to stabilise (while warming), a very small circulation pump would be beneficial. You will probably find that you need to add a bit more Magnesium (Epsom Salts) but you may have this covered with your Fertz