Have had luck with nematodes, you can put them in your res and water as normal (remove filter screen). They will actually eat the eggs adn larvae stopping the breeding cycle.
more info at www.bcbugs.ca/shop/nematodes/
Nematodes work for me, you can put them in your res and water as normal with them (remove the screen filter though) they will actually eat the eggs and larvae and stop the breeding cycle.
more info at