I have a pond that was already on the property I bought a couple of years ago where I built my new house last summer. It is a fairly large pond of about 2 and a half acres and is about 15-18 feet deep. Currently the visibilty is about 4-5 feet. My question is can I put anything in the pond or do anything to help increase the visibilty to 15-20 feet so I could scuba dive in it and be able to see anything? I am told it is fed by a spring.