Will this product kill my fish

[420benz]

I posted this before then i found this product and my goal is to keep the stones from from turning green from algae

 

[420benz]

I guess ill keep pressure washing it. Thanks

 

[GBBUDD]

Any preservative can kill it's a matter of how long you give it to cure and if it's just around in the garden or if it's in the water. I would not use ANY WOOD PRESERVATIVE THAT WAS TO GO IN THE WATER. There is no need to a have a extremely rotted step in.my pond it's been there for 7 years now. It stays wet and hold together if it is allowed to dry out ge t wet dry out then that is a problem

 

[Lisak1]

This will not keep algae from growing in your pond. If your goal is no green on the rocks then you want a pool not a pond.