It is our first summer in our house nears Ferrara. Our property is adjacent to a canal so we have a lot of mosquitoes in the evening. Is anyone aware of an effective repellant that does not contain a signify amount of deet? I have read that the best repellants contain 30% deet but am aldo aware that there are potential risks of long term usage of deet. We would need to use a repellant every evening. Many thanks.