Thanks everyone. I'm going to do a big water change tomorrow to get as much of the silt out as I can. Hopefully I won't get too big of an algae bloom afterward. I'm saving up for a decent UV sterilizer as well, since I've started adding koi.
Well. I did an about 80% water change yesterday... it doesn't look any clearer to me? And some of the hyacinth I have in the pond are looking a little worse for wear now . I'll see how it looks when I get home tonight. Hopefully it will look clearer then.