Alexander wrote:
Hy,

My main concern was calcium accumulation on leaves and substrate. Good
to point out the pH lowering effect of fertilizer. I am mainly looking
for a easy and not to expensive way to get orchid-loving water for a
smal (20 orchids) collection.
Think i'll experiment a little more before investing in a :"You should
use an ion exchange water softener. Forget the acid."

In the long run, ion exchange or reverse osmosis will be cheaper and
less risky to the plants, and to you. Concentrated acids are nasty
stuff.

J. Del Col