the contamination they are talking about i believe is on the bottom of the tank and can be stirred up quite easily, not really sure, as for the sock goto signaturelm.com and talk to bill

98.5 Black SE ATX S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed cant afford an svt but lookin for 1 in nc