Use regularly to maintain your septic and drainage systems. For wastepipes dilute 1:4 with water and add 50ml of the diluted solution to sinks, shower and bath outlets weekly to keep wastepipes clear. Leave overnight to allow microbes maximum munching time. For blocked drains dilute 1:4 with water and apply daily until blockage and smells are gone, then maintain regularly as above. If blockage persists, use a stronger solution either 1:2 with water or undiluted. For septic tanks use 1 litre per m3 tank capacity for one-off treatment. After 2-3 weeks the microbes should have become established in the system. For regular weekly dosing, flush 250ml of drain cleaner (undiluted) per person into your system.