July 26  The drainage method of the pond of the school biotope is an Overflow type.  We do the second sludge cleaning this time.
     It was a strategy to let this strategy created a disturbance at the water of the pond, and sludge overflow with water.It looks like this creates a disturbance and makes a flow of the water.
     It is a place for the place among the leaves of the lotus in the center of the photograph to overflow.  We let a current face one point together.
    July 28  It is the part of the pond after the second sludge cleaning.  We had the parts which sludge disappeared, and showed a bottom.
     The photograph which we took toward the bottom of the pond.A bottom became shallow and came to see a stone.
     This is the general view of the present pond. Do you understand that a pond became beautiful?
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