Lunker...If your water clears overnight in a jar, the cause is some form of mechanical mixing...cattle, carp, bullhead catfish, wind/wave action, WAY too many Channel Catfish...etc
Another big possible cause ids your windmill...it is VERY possible that if a barrier support or stand-off was not used properly or has failed that your diffuser is simply eating a hole in the pond basin and pumping clay up from the bottom along with the water.
