Ugh! Well water and AG pool filters are NOT a good mix, unfortunately.
It sounds like you may have iron in your water. If the water turned brownish orange almost immediately after adding chlorine . . . then you definitely have iron. If -- on the other hand -- it turned a murky dark brown, with no orange tints, you may have manganese, which is much worse.
Iron, once oxidized with chlorine, can be filtered out by most filters . . . EXCEPT overdriven & undersized AG pool sand filters. If you've got anything else, running the pump 24/7 and vacuuming a lot should clear things up. But, if you've got a sand filter, consider replacing it with an oversized DE filter. With metal contaminated well water, removing metals is going to be a recurring need, and it's easier with DE, especially if you get a big one.
If you've got manganese . . . well, let's confirm that, before I try to go into all that. Call your local well driller and ask him what's in the wells in your area.
Best wishes,
Ben
PS: Do lakes in your area really have 'orangey-brown' or 'dark chocolate brown' water in them?
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