Auto pot question

[Arnis&Weed]

Today I noticed this film growing in the auto pots. Is this normal? Should I flush the lines?

 

[elcoloan]

Today I noticed this film growing in the auto pots. Is this normal? Should I flush the lines?

it is normal if using organic fertilizers or if the substrate in the pot placed in that tray has any organic inputs. Id give the lines and tray a little wash just in case.