Even if you start at 5.8 it will wonder and climb to 6.0ph. 5.8 is fine but you will notice that it will climb up on a steady gradual basis. Most tap water is between 6.3 to 7.0 and that is why you have the initial climb. When it starts to drop, a week normally has gone by and its time for a nute change. You will also notice if you grow for a while that the ph in your tap water changes with the climate change of your area so check your ph always before adjusting it. Main reason why I strive for 6.0 is actually broken down to several reasons. MJ plants are well known to thrive at 6.0(Even in its most natural habitat away from human intervention). Many hydro nutrients and fertilizers have natural or manmade ph buffers that keeps the nute water stable for longer periods at a time.(Best stability number I have found is 6.0ph)The last one is water is naturally more stable in ph when you try to maintain a stable ph higher than 5.7.
Using RODI water might be based on a different set of rules.:60:
