One.
It should not be necessary to amend your water for outdoor plants.
Soil has a buffering effect.
And B.
Pool chems, like bleach, (sodium Hypochlorite), are sodium based.
Sodium, as I understand it, negatively affects the osmotic pressure at the cell walls.
With plants, it's better to use Potassium, or Calcium Hypochlorite.
Plants make better use of the breakdown products.
I just sayin', If you must amend, use something useful, yah?
Aloha,
Weeze