OCTENOL Refill bottle 20ml purity 99.8%! OCTENOL Refill bottle 20ml Enough to refill 30 used cartridge! Fast delivery to USA ! Enough to refill 10 used cartridge!!! Octenol is one of the best an attractant for mosquitoes and midges! Promotes efficiency of traps in 3 – 4 times!! we will Combine with all types of electronic traps! It is recommended to renew an attractant every 21 – 28 days.