Thanks very much
Yes, that's what I do
That's the delicate point.
If you pour directly the pond water (with good plankton but without harmful organisms) in the hatching enclosure, then you don't need a water conditioner since this water is not chlorinated.
I know some people will be reluctant to directly use pond water.
If you prefer not to use this pond water, you can use the net, at home, to get rid of this water, scoop up the plankton and put it in dechlorinated water (tap water with conditioner) but I sincerely don't know how these little animals will react to that. Make a test first.