I cannt see the water when using Hydrax~

Hi,everyone,nice to meet you.I got a problem when using Hydrax.
when below the water ,I can feel I was below the water ,but in my application,the effect was very bad.
when I out of the water,I can see the water,however,it looks bad
when I get the higher place ,the water has gone,why??
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thanks for anyone who are pleased to help me!

please post more information about the system you are running it on. Most important your GPU (videocard).