I expect it would have to do with the nature of the practice you wish to engage.
Master Lin's advice is not to perform meditations in water (tub, pool, lake).
I won't go against his advice.
If you are considering doing an eye-open exercise program that uses the SFQ movements I would consider that as okay. However, that is not the true emphasis of the active "meditation". Since the energy follows where the mind goes, the eyes closed is essential to active or sitting meditations. If you engage in this kind of practice I would strongly advice against doing them in water. I personally have had experience which could have serious consequences had I been in even a tub of water.
Guard your own safety.
There are also additional concerns with opening your channels to the universe while in water, since the qi can readily flow out of you body in this state.
I believe there are conditions under which you can enhance just about everything with an understanding and use of qigong.
I'm sure that sounds like mixed advice, but I only see it as my expansion of Master Lin's advice. Everything else said, Master Lin's advice is best. Don't.
You are perfection.
Iam2
