<p>System Leak Sealer or XP-LS is the expert&#39;s choice for the prevention and sealing of small holes and hard-to-find leaks in central heating systems, designed to be safe on all materials that comprise your system - including aluminium.</p> <p>System Leak Sealer is readily dispersable, and will not cause any blockages in any central heating systems.</p> <p>Ensure you dose your system at 1%. Use 1 Litre of System Leak Sealer to every 100 litres of water. Once in the system, we recommend you keep the system circulating for at least fifteen minutes.</p> <p>System Leak Sealer is best used in circulating warm water. Once it is dispersed throughout the central heating system, System Leak Sealer is effective within 24 hours.</p> <h3>Open Systems</h3> <p>With an open system, you should add System Leak Sealer via a feed and expansion cistern using a bypass feeder or dosing vessel.</p> <h3>Sealed Systems</h3> <p>If your sealed system is full, you should inject Sludge and Flux Remover through the filling loop or alternatively, any other appropriate access point.<br /> If your system is empty, simply add the System Leak Sealer wherever is convenient. Once in your system, you may proceed to fill with water.</p> <h3>Exposure Controls</h3> <p>Avoid all unnecessary exposure. Wear protective gloves, appropriate mask and chemical goggles or saftey glasses.</p> <p>&nbsp;</p>