I am trying to create an under water scene but it is not turning out like the tutorial I am following. My main issue is when I come to rendering the image it is extremely grainy and I cant get it to look realistic. Would someone be able to help me with this problem and explain in really basic terms as I have no other experience with these kind of projects. Thanks in advance! 
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Louise
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2Have you read any of the related links to the right, or searched "grainy cycles"? – zeffii Sep 06 '16 at 08:41
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Try disabling caustics (reflective and refractive) in the render settings. – JakeD Sep 06 '16 at 11:38
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Its a viewport render preview at 32 samples. No wonder its grainy. Increase the samples. With glass materials try at least 1000.
AdamTM
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