pond 1 lead 0.0 copper 0.025 iron 0.0 mercury 0.0
pond 2 lead 0.0 copper 0.05 iron 0.3 mercury 0.0
pond 3 lead 0.0 copper 0.0 iron 0.3 mercury 0.002
Iron: Tap water is clean, p1 is also clean, p2 is clean but alo a little dirty, 1st p3 is like p2, 2nd p3 is the dirtiest out of all of them.
H: Can the damsel fly live in p1?
C: Damsel flies can´t live in p1 because it does not have the right substances.