In thirteen years of running my truck 98percent of the time on B100 I never had alge growth problem till last winter. I forgot to add a biocide in the last fill up and then had health problems that kept the truck siting a lot most of the winter. Upon using the truck much more in the spring I started clogging fuel filters. In the end I put together a pump and filter system that worked thru the fill hose access. That and a healthy dose of biocide. I have found a good boating supply house a good source of biocide, saw it at Pep Boys also.