Figure 3. Detailed illustrations of double-netting, second section. (A) First net separated from the second net and its bottom held; (B) first net turned over the Petri dish; inner side of the net with the debris pulled down in contact with the water; (C) first net reversed totally and shaken horizontally; (D) and vertically; (E) first net pulled out the water; (F) first net placed over the second net in the same orientation; (G) both nets overlapped; (H) and washed in circular motion with gentle flow; (I) first net removed; (J) second net only; (K) second net washed in circular motion; (L) and held from the bottom. Black arrows indicate the directions to shake and wash the nets.