A. To help prevent root rot, as fungi and mold like higher ph's in the alkaline levels.
What is the pH of your RO?
Mine is nuetral,
so not alkaline,
and not the "favorite" environment for algae or mold.
There is nothing in the RO for algae or mold to eat.
My "RO only rez" never gets mold or fungus,
I know, because I drink out of it,
and I don't put phosphoric acid in my drinking water.
B. ph of 7.0 or higher can lock out nutrients such as magnesium iron and calcium.
Since we are flushing with RO,
there is no magnesium or calcium,
that can be "locked out"
The plant still has plenty of nutrients,
inside the roots and leaves,
and the pH does not affect them,
once they are inside the plant.
C. Too acidic and you lock out things like nitrogen and potasium. An some other non mobile elements.
Again RO only...
no P or N ,
or any elements to lock out.
There is nothing "out there"
Having a ph between 6.3 and 6.8 is ideal(5.5-6.3 in hydro).
Hope this clears that up earl.
So no panda,
I am still very confused,
why anyone would find a reason,
to pH adjust pure RO.
I have kept a mature White Widow for 6 weeks, on RO only.
Never put your pH probe into pure RO!
.
.