FREE BIOCIDE ADDITIVE Amalgamated, Inc is offering free biocide additive for you to treat your customers tanks with the purchase of any of the Diesel Pro® line of additive. Free biocide must be requested at the time of purchase. Additive purchases must be of 55 gallon drums, 330 gallon totes, or bulk transport to qualify. Additional restrictions may apply. Contact us via email or call 260-489-2549 for more details.