Nutrafin Betta Enviro-Clean 60 mL (2 fl oz), is a betta bowl cleaner that biologically breaks down waste in betta bowls and containers while promoting clean conditions that help reduce diseases. Biological Betta Bowl Cleaner Reduces Organic Waste in Betta Bowls Helps Reduce Disease Helps Reduce Stress INSTRUCTIONS: Shake well before using 2.5 mL (approx. ? capful) treats 3.78 L (1 U.S. gal / 0.83 U.K. gal) with every water change