We have seen NO issue in new tanks, but Bio in older systems will clean deposits from those systems, hence the filter issues. All of our bulk tanks are steel, from 5,000 gal. to 18,000 gal. Also be aware that bio held over winter when there may be more condensation needs treated to avoid algae growth. This can apply to diesel also, but is less prevalent. Lastly, bio does affect many older fuel hose type apparatus over time....