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Perhaps boric acid or sodium borate can be added to the paper layer or slurry of gypsum during the making of wallboard.
Vacuum the boric acid up 24 hours later and it is said to prevent fleas for 1 year or until your carpets are shampooed.
This is equivalent to an average-sized adult ingesting over 3 g boric acid daily before reaching the ‘no observed adverse effect level’ threshold.
Poison baits, boric acid , and traps are preferred to chemical agents because the latter can be irritating when inhaled by asthma patients.
In geothermal waters, hydrogen sulphide, silicic acid, and boric acid may also be important.