A floating deck is going to be extremely cumbersome and heavy. It will also not be completely stable under load . . . and it will move up and down with the water level. Where do you plan to store the deck, during the pool season?
It seems to me that, assuming you have a place for storage would be easier to build a raised deck that would span the pool -- I'm assuming it's a small one, and fairly narrow. If so, you could build a deck in sections 2-3' wide x the width of the pool + 1'. If you are careful about the design, several men should be able to handle and stack the sections . . . once the wood is 100% dry. You'll need to use treated lumber + stainless fasteners, and you'll want to seal the wood, once it's fully dried out.
The difficulty will be getting a design. If you can find a local truss company that will design & build the trusses needed, using treated lumber and stainless gang plates, you're probably home free. They should be able to work out the best points to attach trusses to adjacent sections, as well, using stainless bolts and washers. If you seal the wood, to prevent weathering and warping, and use appropriate fasteners, your 'pool deck' could last 10+ years.
Aluminum, galvanized steel, and un-treated wood are all unsuited for near-pool placement. Only stainless or bronze is suitable for immersive pool placement, so be careful.
Good luck!
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