I agree with 4pack..

hydrogen peroxide...

are the larva harming your plants?

there is a way to shock the water ... and it wont kill your plants but it kills bug in water... I dont know much about it...

Maybe ZANDOR will know...

there are two different methods.. ne is using electricity.. and the other is like a sound blast in the water....

both are benign methods that don't pollut the water...


keep us posted

: )