What causes dark green water in my pond? Just re filled yesterday and today dark green with no algae?

Question

When I cleaned the pond, there was white stuff on rubber sheet. Cleaned that and filled and next day dark green water even with filter going all night.....Put algae killer in with no results.... help

Answer 1

It's mostly likely some form of algae... it might not be free flowing (in the water column), instead it's probably grown to the bottom and sides of the pond making it look green.

Answer 2

did you clean out the filter at the same time?....