Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Another way is to hold the gravel vac at an angle. One edge can touch the EC, and stir up the debris, but since it is at a slant it will not pick up the EC.
Another way is to hold your hand wrapped around the outlet tube, and pinch it off to slow the water flow when the siphon gets half full of EC.