> Thank you both for your suggestions. May be the addition of an other 
> media may cure the problem but I had a lot of difficulties to adjust the 
> media as they are so far and will not risk to disturb them by another 
> one. The other approach proposed by Thomas is the use of a texture_map 
> to the lake similiar to the construction of my sky_sphere. Fortunatelly 
> air has no ripples or waves and is more predictable as water. May be I 
> must have more patience in modellng a filtering disc with a proper 
> scaled hole
> 
> disc {





> }
> 
> Best regards
> Michael
> 

When working with disc, don't forget that they have an interior that is 
not limited to the visible part.
Whenever you have media, you need to add hollow to any disc in the scene.

This :
disc{0 y 10}
have the same interior as this :
plane{y 0}

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