Septic Tank Treatment sachets contain natural bacteria and plant extracts to break down solids & eliminate odours without harsh chemicals. Using 1 sachet a month helps to maintain healthy septic tank bacteria, avoid expensive blockages and treat bad odours. Organic tank treatment powder is contained in plastic-free, dissolvable sachets for easy use. Just one 50g sachet per month is the perfect dose for a natural, heavy duty treatment. Our biodegradable septic tank treatment sachets are safe to use in any waste tank. Add 1 dissolvable sachet bag into the toilet, flush to enter the septic tank. Use once a month for tank maintenance.