Sewage treatment plant :

Direct dosing to the sewage treatment plant or via the nearest toilet will greatly enhance the biological activity and keep the plant at peak operating efficiency.

A)    On ships except passenger vessels

Ineffective or septic sewage treatment can be reactivated and maintained in peak operating efficiency by dosing Rxsol Zyme 700 FN direct in the tank or via the nearest toilet. To reactivate the plant, 1 kg Rxsol Zyme 700 FN  should be mixed with 10-15 litres of hand hot (35°C) fresh water, left for 10-15 minutes (stirring periodically) for the bacteria to activate before dosing into the tank daily until the system is operating efficiently. Maintenance dosing of 0.1 - 0.25 kg weekly will keep the system operating effectively. Replacing the toilet cleaner in use by Rxsol Zyme BTC (biological toilet cleaner) will dose millions of specialised bacteria into the system. These powerful bacteria will digest organic material lining the pipes and boost the bacterial activity in the sewage treatment plant, keeping it operating at peak efficiency.

Passenger vessels

The applications is the same as mentioned above, but the dose rates are different. The dose rate depends on the number of people on board the vessel. As a rule of thumb use 50 gram per m3 of the volume of the sewage tank. Then a weekly dosage of 10 gram per m3 of the volume of the sewage tank.

For  cruise vessel with a sewage tank on 100 m3 and 2500 people and on a two weeks cruise dose as below

Initial dosage: (50 g/m3 x 100 m3 ):1000 = 5 kg
Weekly dosage: (10 g/m3 x 100 m3 ):1000 x 2 weeks = 2 kg
On this cruise, will be used. 7 kg of Rxsol Zyme 700 FN
Tank Cleaning

Holding tanks can be cleaned periodically or prior to entry without the use of dangerous toxic chemicals. Grey and black water holding tanks, sewage tanks, sewage treatment plant should be flooded and pumped empty to clear excess soil before cleaning. Holding tanks must be fitted with an air manifold connected to a low pressure air line of sufficient volume to gently turn the mass of water within the tank. In sewage treatment tanks the normal air supply will suffice.

The tank should be filled to 75% capacity with fresh or sea water and the air supply turned on. Approximately 0.5 kg of Rxsol Zyme 700 FN in 5 to 10 litres of fresh hand hot (35°C) water should be mixed and left for 10-15 minutes before dosing into the tank. Dosing can be either direct or via the nearest toilet. The tank should then be filled and left with the air on for at least 48 hours. The dose rate should be approximately 0.5 kg per 500 litres tank capacity with a minimum dose of 5 kg. Although Rxsol Zyme 700 FN formulated for use in cold (15°C minimum) sea water, performance will improve with lukewarm (35°C) fresh water or sea water.
Pipe cleaning

Maintenance dosing will keep galley and sewage pipes clean and clear of organic residual wastes. A liquid solution should be prepared by mixing of 0.5 kg of Rxsol Zyme 700 FN in 15 to 20 litres of hand hot (35°C) fresh water. Stir it and, if possible, leave for 15 minutes to reactivate the bacteria. Whilst constantly agitating this solution, 1 litre should be dosed into sinks, scuppers, showers, drains, waste disposal units, etc. each evening until the blockage is cleared. A maintenance dose once or twice a week can then be applied to keep the pipes in clean condition. Harsh toxic cleaners (acids, caustics, disinfectants) should not be used as these will kill off the bacterial action in the pipes. Alternatively, the pipes should be isolated and filled with the solution and left for up to 48 hours before draining. If necessary, further applications should be made until drains run clear.