Interesting idea. The passive traps I have either need to be manually emptied and/or use donuts or bits. Some challenges: The purging is a difficult part to g

Interesting idea. The passive traps I have either need to be manually emptied and/or use donuts or bits. Some challenges: The purging is a difficult part to get right. You need to be absolutely sure no larvae or eggs survive it. Also if you purge the water regularly it will be less brackish, so less attractive to many species for egg laying. I include decomposing plant matter in my traps in the hopes it makes it more attractive. I would say definitely check out the biogents passive trap design, it has some clever ideas in a very very simple design.