entities not being visible

I have a great deal of entities in me map, unfortunately when i run my map these enttites trigger but some graphical effects are not visible, most noticeabley explosions and dust clouds. I don't have any leaks in the map this i am sure of and also am sure the entites are triggering, for example the eplxosion has a sound but doesn't physically appear. Has anyone got any idea why this map be happening? Some of the entites are half buried in func_breakable or func_physbox, (the explosion entities are inside a hollow pipe that is a func_physbox) i can't figure out what the problem is and it's really ruiningthe ambience of my map. Here is a screenshot of the opening sequence of the map, it may have been seen before but some updates have been made. Cheers guys.

if you can see your water, then yes, you have no leaks.

have you tried moving these entities out into the open, instead of burying them inside brushes?

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