You’ll need to repeat the procedure at the very least 2 times weekly until you stop noticing fruit fly activity. Treating the potting soil with Epsom salt or hydrogen peroxide removes the fungus gnat’s eggs and their larvae. Although they're undeniably a nuisance, fruit flies don't explicitly pose any wellness https://howtogetridof.it.com/pest-control/how-to-get-rid-of-fruit-flies/