Treated wood sawdust

Welcome to the forum:wave:

There is probably little correlation between your construction and a green pool.

Pools turn green because algae is allowed to grow. Algae grows in a pool where there is inadequate chlorine.

Please read "The "ABC's of Pool Water Chemistry" up in Pool School
 
While treated wood has copper in a few forms in it, you would have to get a ton of sawdust in the pool and it would have to sit in there for a pretty good while in order to leach enough copper in the pool to affect the water.

I think Marty and Dave are leading you down the right path to find out what the issue is.
 
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