This biological holding tank treatment uses natural nitrate compounds to accelerate waste breakdown and eliminate odour in RV and marine systems. Formaldehyde-free and fragrance-free, it remains safe for users with chemical sensitivities. Each 8-ounce bottle treats up to 40 gallons of tank capacity, and this box contains four bottles—a full season of monthly treatments. Biodegradable and environmentally responsible.

• Biological formula, formaldehyde-free
• Natural nitrate compounds
• One 8-ounce dose treats 40 gallons
• Box of 4 bottles
• Unscented, fragrance-free