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Did nothing at all
I tried Dekko packs about a year ago when I had a substantial silverfish infestation. I tried everything else too (boric acid, diatomaceous earth, cheap dehumidifiers). I even used to get up late at night and hunt them in the dark. The silverfish have no apparent interest in Dekko packs whatsoever. I left them out for a couple months, tucked in obscure dark cervices, out in the open, all over. I still find some I left out sometimes. I've never seen a nibble on a pack and I've never seen a dead silverfish I didn't kill myself (except after the bug spray).
My advice after trying everything:
* Get some 6-month residual bug spray to spray under the baseboards and generally work into the walls
** I found dozens of silverfish corpses the next day and hopefully more died in the walls
* Seal the baseboards with caulk (lock in all the nasty bug spray)
* Keep it clean, dry and cool. Leave windows open in the evening
* Get a hyrgometer/thermometer combo to measure the temp and humidity in your house to see how you're doing
* Squish 'em at night
A year later I still see about one per week, but that's a lot better than a dozen per night like it used to be.
Please don't waste your money on these packs. They probably cost a penny to make and do nothing. Great scam.
August 2018 · Health and Household · verified purchase