This is similar to what we use and is 36.8% concentrate. Dilute it down pretty easily and put it in a pump sprayer. More economical than buying the Sawyer.
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This is the method I use as well. I mix a couple gallons and soak my clothing, then drip dry. I've been told that permethrin in the liquid form is toxic to cats and may kill them, so store it accordingly. That said, we use it on our dogs at our property well, and it really helps with seed ticks on them.
A few years ago, I found a dilution guide online that I keep on my phone - it has dilution rates for various concentrations that are commonly available. I buy the 36.8% on Amazon, as it's the most economical option by far.
See below (copied from the file on my phone):
Tick-proofing clothes using .5% permethrin
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Use a .5% permethrin solution for soaking your clothes.
NOTE: that is "point five percent" (one half percent) NOT "five percent"!
Recipes to make 1 gallon (or 4 liters) of .5% solution.
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Using 36.8% permethrin concentrate
Note: it may say "Permethrin SFR" on the bottle.
1 gallon = 4 quarts = 128 ounces
1 gallon water + 2 ounces 36.8% permethrin = 130 ounces of .51% concentration
COST $.85 per ounce x 2 = $1.70
Metric
4 liters water + 20 ml 36.8% permethrin = 4 liters of .5% permethrin (1/2%
concentration)
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Using 10% permethrin concentrate
1 gallon water + 6.75 oz 10% Permethrin = 124.75 oz at .5% concentration
COST $.75 per ounce x 6.75 = $5.06
Metric
4 liters water + 200 ml 10% permethrin = 4.2 liters at .5% concentration
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Where to buy permethrin
At my website I have links to where to get the best deal on permethrin. These are the
same places where I bought permethrin for myself.
Cost
Obviously 36.8% permethrin is the way to go…it costs 3 times as much if you use 10%
permethrin concentrate, but they will both work.
Instructions for use
Mix it up (as per the above recipes). Soak your clothes for two hours in a ziploc bag, a
plastic bin or a 5 gallon bucket. Your choice.
Wring out the clothes. Leave them wet but not dripping.
Hang them on the line and let them dry.
Laundry
Supposedly this will remain effective through 6 washings and for 6 weeks. Hand
washing is recommended. Machine washing and drying should be on the gentle
settings. You can always re-apply the .5% permethrin after washing if you are in any
doubt.
Cats and fish
Permethrin is toxic for cats and fish. So don't let your cats near it when it's wet (it can be
fatal for cats). Your clothes are safe once they're dry.
Storage
Do not pour out the leftover in a pond or near any waterway (it kills fish). If you can, just
let the extra evaporate or store it in a bottle or put it in a spray bottle for later use.
Sunlight deteriorates permethrin, so store the bottle in a dark place such as in a
cabinet.
