Click Here to Contact Us

Contact Form

Aviation Products // Line Maintenance & Exterior Cleaning

System 38 Lavatory System Line Scale Remover
  • Water-based and biodegradable.
  • Effectively removes scale deposits and stains
  • Cost effective, no need for crushed ice
  • Non-corrosive formulation, safe and user friendly
  • Easy to use and fast acting
  • Safe on stainless steel and most plastics
  • Viscous liquid with cling action technology
  • No flash point and low volatile organic compounds (VOC)


Callington Unblock LSR has been specially formulated to prevent the formation of limescale, calcium and other deposit build-ups in aircrafts and helps to maintain a fully functioning toilet system. Unblock-LSR uses a proprietary blend of surfactants along with mild organic acids, and foaming agents to deliver a non-corrosive, safe and strong cleaner and toilet line protector.

By utilizing unique clinging action technology, Unblock LSR can completely coat waste tube walls and remain as a coat to soften the existing scale and prepare it for removal without the use of crushed ice or ice cubes.

Unblock-LSR is a leading-edge preventive technology to eliminate or minimize the formation of urine scale in vacuum toilet waste lines and tanks. Daily or bi-weekly cleaning with Unblock LSR will help airline operators to avoid the high costs and downtime associated as a result of line clogs.


Callington Unblock LSR is suitable for both vacuum and re-circulating toilets. It is powerful enough after dilution for its usage in a regular maintenance cycle. 

Directions for Use

Crushed ice is not required to improve Unblock-S. Using instructions:

Step 1: Every 1-3 days dose each lavatory with Unblock LSR. Suitable dosing is 235 ml of Unblock LSR per toilet per day, or 1.5 Litres of Unblock LSR if the dosing is done once a week.

Step 2: Use a brush to remove any stains or scale in the toilet bowl. If the bowl is heavily soiled use slightly more than recommended.

Step 3: Flush once and leave the product to sit overnight or as long as possible. As the product sits overnight, it will cling and coat the tube wall and the penetrating action of the Unblock LSR will help with softening and effective and efficient removal of the scale.

Step 4: Unblock LSR should remain in the line through the first flush until the next passenger uses it.


• AMS 1640C

Physical Properties

Appearance:               Amber-colour viscous liquid      

pH:                              2.5 +/- 1.0                    

Ordering Info

Product CodePackaging
5124/42 5L
5124/51 20L
5124/64 200L
Related Products