Thornton, M. K.

Ulich, Willie L.

English

Texas A&M University

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= ....~/CULTURAL EXTENSION SERVICE
~on, Direclor, College Station, Texas
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REMOVING GREEN SCUM FROM TANKS AND RESERVOIRS
With Bluestone
M. K. THORNTON, Extension Agricultural Chemist
WILLIE L. ULICH, Extension Agricultural Engineer
Texas A. & M. College System
WHEN WATER IN STOCK troughs, reservoirs or
ponds is exposed to sunlight, it may become
covered with a green scum or slime. The best
way to avoid this trouble is to put a cover or
roof over the water to keep out the sunlight.
Green scum can be killed with bluestone (copper
sUlphate). The bluestone will lose its ef-
fectivenes~ in a short time and the scum may
grow again from new seed raIling in fresh
water. If this occurs, the treatment must be
repeated. Too much bluestone is injurious to
livestock, humans or fish and care should be
taken to add only the proper amount to the
water.
Safe dosage is 8 pounds of bluestone per mil-
lion gallons; 1 ounce per 8,000 gallons; or
1 level teaspoonfUl per 1,500 gallons of water.
Dissolve the proper amount of bluestone in a
few gallons of water in a wooden, stoneware
or enamelware container. Then stir the solu-
tion slowly into the water that is to be treat-
ed. Some of the treated water should be splashed
on the trough walls so that the scum there will
be killed.
In small tanks, the scum may be prevented from
re-forming by placing pieces of copper sheets
or shavings in the water. This is done best by
nailing the copper sheet on wooden posts set
in the tank.
The copper will be effective for a long time
unless it becomes covered wi th di rt and. slime.
In treating ponds, bluestone may be put in a
sack and dragged through the water from a boat
until all of it is dissolved.
Concentrations as high as 6 pounds of blue-
stone per acre-foot of water, or 20 pounds per
million gallons, have been used in ponds with
no harmful effects. In treating a pond that
has skin fish in it, (such as catfish) it is
well to treat one end of the pond at a time
so as to give the fish an opportunity to move
away from the highly concentrated solution
near the boat. Scale fish are less sensitive.
Cooperative Extension Work in Agriculture and Home.
Economics, The Texas A. & M. College System and the
United States Department of Agriculture ~ooperating.
Distributed in furtherance of the Acts of Congress
of May 8, 1914, as amended, and June 30. 1914.


Removing Green Scum from Tanks and Reservoirs with Bluestone.

https://oaktrust.library.tamu.edu/bitstream/1969.1/160931/3/55/Leaf0055.PDF

Removing Green Scum from Tanks and Reservoirs with Bluestone.

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