How to return the original Shader the water when using OpenMW? (The Elder Scrolls 3: Morrowind)

Hello! I recently here on the forum, was advised to use the OpenMW engine, if you experience performance issues playing Morrowind on modern hardware running Windows 7 and above.(the theme is the Fall of fps and jerking pictures) I use this engine and I am very happy, because it just increases the performance, but here's the problem: the fact that OpenMW is a new beautiful water Shader. She's beautiful and pleasing to the eye, no doubt, but I'm personally a fan of the original water, because I think that it looks atmospheric. If in the game settings to disable these new shaders, instead of the vanilla Shader water appears muddy water, which is shown when you disable Pixel shadow in the launcher settings. If someone not in the theme, here, it looks like the new water Shader:
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And that's how it looks, if you disable these new shaders(like in vanilla Morrowind on the minimum salary):
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And here how looks the water in vanilla Morrowind when enabled, Pixel shadow:
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In General, how can we regain the original water? I would go back to the original, but, damn it, in the original Morrowind to OpenMW without performance is not the same... If anyone knows, please tell me how to get her back. Thanks in advance to all!