At both of our island properties we used a whole house filter and a Trojan UV only. Never a problem.
On Mark we had deep water with a submersible pump. On Bear, a jet pump with very shallow water. Our pickup was in 3-4 feet of water (300-400 feet offshore), and only the height of a cinder block off the bottom. Depth was a problem there, to get it much deeper we would have been probably 800 feet out.
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