Hi Thisara,  you may need to ...

Hi Thisara,  you may need to modify the pH with the application of aeration.  Higher pH (>6.5) will improve oxidation of iron.  The floc formed by the oxidation of iron may be sufficient to coagulate the turbidity, but you may also need to add an additional flocculant as it looks a bit low. Ammonia can be removed with clinoptillolite - a natural zeolite that is normally quite cheap.  Place a layer on your filters or a dedicated exchange column.  You may also want to try to identify where the ammonia is coming from (e.g. fertilizers, cattle pens, on-site sanitation) and then try to manage these to reduce the ammonia in the longer term.  The manganese is quite low, andnwill precipitate out with higher pH.