Boracare does need to be diluted depending on what you are intending to use the product for. For an active infestation of a wood destroying insect, you will use 1 gallon of hot water with 1 gallon of Boracare. The percentage of active ingredient is 23% in that dilution.
2:1 parts water to Boracare – 16% - foaming or misting application for termites or carpenter ants; hardwood floors for some wood-infesting beetles
3:1 parts water to Boracare – 13% - remedial control of Fungi and Algae on wood less than 4 inches thick
5:1 parts water to Boracare – 9% - most preventative or pre-construction treatments.