Rangerscott mentioned the filter. Is it a sand filter or a pleated filter element (like a large oil filter)? If it is the pleated kind take it out of the housing and clean all the crap off it with decent pressure from a hose nozzle. If it is the sand kind when was the last time you backwashed it? If either type of filter is real dirty the water will never get clear. Also already mentioned was shocking it. You said you already did that. The pool looks like it has a vinyl/plastic liner. You may want to be a bit careful with too many shock treatments and a vinyl/plastic liner pool as the material can wear out quick as hell. If it is vinyl/plastic I would get the water tested before shocking it again. Good luck.
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