Pro-Pump/TST is a liquid biological formulation designed as a “Total System Treatment.” It comes packaged with 12 pints in a single box designed for monthly addition to your drain lines to control odor, reduce line blockages and treat your septic system, in a single application. Just add one quart of Pro-Pump/HC each year in your septic tank and then use one pint of Pro-Pump/TST each month divided between all of your drain lines. You can dilute the concentrate TST in a gallon of water or use full strength to treat every drain in your home.