Vacuum Toilet Pipe Cleaning & Waste Pipe Descaling System

Unblocking Restricted Waste Water Vacuum Pipework


With the Marinevac System, all your vacuum toilets remain in working order whilst the system is being cleaned. 


  • Unobtrusive equipment with easy set up
  • Reduced risk of leaks or spillages due to pipe work being under vacuum
  • Not detrimental to biological process of STP
  • Waste water pipework does not need to be dismantled
  • All Marinevac staff are trained experts in yacht waste pipe cleaning
  • The unique self-contained unit is compact and mobile.
  • The cleaning technique can be performed without any effect or disruption to the vessel’s normal operation.
  • No flushing hoses around the ship


The Marinevac system is the preferred method of descaling vacuum system pipework on many Superyachts, large Cruise Ships, Oil Rigs the British Navy & Royal Australian Navy.


We believe that this is by far the best available waste water pipe cleaning service available today.  


The effectiveness and safe action of the Marinevac cleaning method is due to:

Spiral Action
Previous experience has proved that the slug of sewage moves down the vacuum pipe work in a spiral action. Consequently, the chemical will move in the same manner, thereby ensuring that the complete wall of the pipework will eventually be coated with the chemical.

Little and Often
With the inherent spiral action Marinevac only requires a small amount of chemical on a “Little and Often” basis, which would not be considered detrimental to the sewage treatment plant biological process, toilet mechanisms or pipe work.

The quantity and strength of chemical injected into the system in a normal cleaning cycle can be considered minimal and is usually discharged into the vacuum collection plant before disposal either directly overboard or to an STP. The solution eventually becomes diluted within the pipe work and tank contents.

For further information or to request a quote please contact us today

Blocked Black Water Lines on Yachts


Imagine the nightmare scenario…it’s the middle of the season with a full complement of guests and crew and your evac toilet system blocks up!


This would not only be an embarrassing issue for the Captain, crew and guests on board but could be extremely costly and difficult to rectify at short notice whilst afloat.


Waste build up in yacht waste pipes is a result of calcium, magnesium and struvite deposits. Struvite is deposited in a variety of forms dependant of the pH of surrounding media, either as rhomboid, platelet or needle shaped crystals, these provide a larger surface area which traps and encourages the deposits. This can build up rapidly and consequently reduce the bore until nearly or completely closed. Such a restriction will cause blockages in the vacuum line and can result in major issues within the system and even flooding.


Yacht waste pipe blockages are always difficult to locate and even more difficult to access and remedy, usually involving disruption of surrounding furniture and carpentry work and certainly downtime in the sewage system itself; major inconvenience to guests and crew alike.


An annual yacht sewage cleaning service is the only way of avoiding this problem. And unfortunately, current cleaning solutions are inconvenient and, as many yacht’s engineers will testify, may cause more problems than those their purpose is to avoid!


The Problem with Current Super-Yacht Waste Pipe Cleaning?


The common current methods for cleaning evac toilets on yachts all have their disadvantages:


Periodical cleaning from in line automatic dosing units.

  • These are fitted to your vacuum pipe work but can prove to be expensive and ineffective due to the following:
  • Connected to the horizontal sections of pipe work leaving the risers untreated which in time will result in blockages.
  • Easily positioned incorrectly along pipe runs resulting in inconsistent cleaning.
  • Continuous cleaning is unnecessary and expensive.
  • Increased man hours to maintain and monitor the chemical.
  • Dosing bottles require storage space for easy access.
  • Increased possibility of vacuum leaks from additional equipment.


Periodical cleaning from in toilet.

Small quantities of either naturally formulated or chemical products are flushed down the toilet at the end of each line. Unfortunately, this remains ineffective over long pipe runs, as the products quickly dissipate and dilute within small sections of the pipe, having little or no effect on the removal of large scale build up. This method is very time consuming, expensive and can also cause blockages throughout the system by moving chunks of scale from one particular area.


Pour and soak method.

Certain evac toilets are taken out of operation whilst the lines are saturated in a mixture of acid and water. All toilet discharges must be plugged to ensure the acid does not get into the operating mechanisms. They must also be monitored regularly for leaks and be proved with water prior to administering acid. This can cause damage and will cause disruption of services on board the vessel. It is also important that the acid solution is not dropped to the tank too soon; otherwise blockages will occur (particularly with PVC pipe work).


Closed loop recirculation.

Again, toilets are taken out of operation whilst the waste pipes are being cleaned. The line is broken into via a flange or valve and a return line connected to an acid recirculation bath and pump unit. The supply is then connected to the vacuum central incoming flange and the acid/water solution plumped round the pipe work in a “close loop” system. More effective than the above methods, a better cleaning is ensured by removing air pockets. Again, all of the toilet discharges must be plugged to ensure that the acid does not get into the operation mechanisms. Pipework must also be monitored regularly for leaks and must be proved with water prior to administering acid. This can cause damage and will cause disruption of services on board the vessel.

The Result


As you will see from the before and after pictures below, the Marinevac black line cleaning treatment will remove scale build-up leaving the pipe completely clean.



1 Before

1 Before

1 After

1 After

2 Before


2 After


3 Before

3 before

3 After

3 after

4 Before


4 After


5 Before


5 After


6 Before


6 After


7 Before


7 After


8 Before


8 After

Contact us to discuss your Vacuum de-Scaling requirements >>>

9 Before


9 After


10 Before


10 After


11 Before


11 After


12 Before


12 After


13 Before


13 After


14 Before


14 After


15 Before


15 After


16 Before


16 After


17 Before


17 After