Boracare should not be hard. When was this product purchased? Did you get this from us?
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Boracare is not meant to be used as soil treatment product and should not be used in that way. Boracare is only labeld to treat termites, wood destroying insects, powderpost beetles on raw undtreated wood. For preventative treatments, mix at 5:1 ratio and 1:1 ratio for active treatments.
Termidor SC is the best product for soil barrier treatments and will last 10 years in the soil. Please take a look at Termite Control Articles here and How To Do Your Own Termite Treatment Article for more detailed information.
For an active Drywood termite infestation, mix 1 gallon of BoraCare with 1 gallon of water.
One gallon of Bora-Care will treat approximately 100 lineal feet of 2 x 4 stud wall. Typically, one gallon of concentrate Bora-Care will treat 800 square feet of a 2x4 stud wall, and 500 square feet of a crawl space or attic.
Depending on how big of an area and what specifically you are treating for drywood termites (floors, furniture, crawlspace,etc) will depend on how much BoraCare to use.