A biological Grey Water Additive (GWA) that may be added to waste water-holding tanks and drain lines. Suitable for dosing all on-board drain lines and will ensure a more ph. neutral, safer and odour- free grey water system. High concentration of natural bacteria break down organic waste quickly and effectively. A ready to use liquid. Dose directly into the drain line (see instructions below) Ph. neutral. Phosphate free. Safe to handle. Formulation is compliant to MARPOL Annex 5 1.7.5 and is declared not harmful to the marine environment. Available in 5 litre, 1 litre and handy 50ml sachet sizes Product codes 5 litres (1.32 US Gallons): EWM10138 EAN 5060303470547 1 litre (33.8 fl.oz) : EWM10120 EAN 5060303470615 Also available in 10, 20 and 1000 litre containers.