It looks kinda like the water should overflow over the objects drifting 
inside. I understand how this is ultra-hard (maybe impossible) using a 
height-based algorithm so maybe you could try raising the objects a bit?

-- 
light_source#macro G(E)sphere{z+E*y*5e-3.04rotate-z*E*6pigment{rgbt#end{
20*y-10#local n=162;1}#while(n)#local n=n-.3;G(n)x}}G(-n).7}}#end//GregE

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