hey , trying to figure this out what the ratio would be and what materials I would have to use to make a 20 000 lt pool of murky water. TIA
Welcome 
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Ratio ?? For example 5m x 4m x 1m = 20 m^3 = 20000 litre ?
Materials ?? Maybe adding some volume… https://blender.stackexchange.com/questions/107236/how-to-make-my-water-look-murky or faking this by using multiple layers of semi transparent geometry layers…