OK Dave I didnt realize that..I'll check into other methods..Came back from the pond just now..Clarity is down to about 15 inches now and I noticed small air bubbles forming on the green moss that builds up on the clay bottom around the edges is where u can see it good..Fish are more active now...I lost a few of my largest LMB around 5 pounds..I expect more to float but as of now could have been much worse I guess.