Most Pond plants will grow happily in pretty much any substrata, in baskets or equally happy just straight into the silt that inevitably settles in the bottom. The main reason for baskets is to keep them from getting too out of control. I wouldn’t worry about the planter making the pond water dirty, presuming you don’t have a torrent of water gushing through it, the soil will settle itself down after a day or two, even if to begin with some comes through for the top to the bottom. It will eventually settle on the bottom somewhere once any rogue stuff has been though the system a couple of times I think filling it with gravel will work fine and will actually act as a filter more than anything so will actually clean the water, and many plants will grow happily in that
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