As Ted mentioned the ...

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As Ted mentioned the Australians have a good system and so do the Germans - Wisy, 3P Technik, Intewa.... The design is the issue. You need to design the system to not allow midges in or out. Having a screen in the inflow to keep them and debris out and a pee trap on the overflow to block them from leaving. We have the mosquito issue in the USA. An uncovered tank does not help the matter. for more info go to http://arcsa.org