We have a pool/spa under a birdcage. We removed the entire screen wall between the pool deck and lanai which created spacious open access. The roof overhang and westerly direction of that opening result in little or no wind and rain entering the lanai. But we glassed in the south lanai wall which eliminated wind and rain which did come in on that side. If you keep one wall open you can use tempered glass, which is safe and permanently clear. If you enclose the entire lanai, you must either use acrylic, which scratches and clouds up easily, or glass, which classifies the area as an "interior" room. That requires that the floor be raised to the same height as the rest of the house and a new tax assessment.
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