Making WaterRenderPass translucent?

I have WaterRenderPass in my heightmap and what bothers me is it’s not translucent.

Here’s how it appears:

It looks more like a lake of a silverish liquid, mercury or something. I was trying to figure out how I could make it a bit translucent so the terrain could be seen.

Any ideas?

There are already lot of subjects with water transparency problems, try to search in the forum.

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