“That is, it would overcome the problem of the electrostatic repulsion between the negatively charged particles, allow them to flocculate and get much bigger, and then settle in another tank.” That ...

This makes them sticky and causes them to clump together (flocculate). These flocculated clumps of cells are then large enough to be trapped by the mechanical part of your filter and thus your pond ...

“That is, it would overcome the problem of the electrostatic repulsion between the negatively charged particles, allow them to flocculate and get much bigger, and then settle in another tank.