“We let the water circulate for a week, then we slowly add in the koi,” he says. They typically come in transparent bags and ...

Xie, corresponding author of the study. The efficient multi-stage treatment system integrates a sedimentation pond, a first filtration dam, an aeration pond, a second filtration dam, a biological ...

or aerator to your pond creates movement, discouraging mosquitoes from laying eggs (mosquitoes lay eggs in stagnant water).