Every 24 Hrs I will test the water it has been soaking in and then change the R/O water and leave for another 24hrs to soak.

It maybe quicker to keep rinsing the substrate every few hours; but i don't plan on adding it to the tank for a while so thought i would take my time :smile:

Plus the ALK is reading way above 30dkh and i was interested to see how quickly this would drop.

By no means a scientific experiment though :redface:

S.