Could remove the plug from the top of the rad and use whatever funnel type arrangement to introduce the liquids directly into the rad, this gets the chemicals into the system straight away.

Maintaining system health is essential for ensuring that it runs both reliably and in an energy-efficient way, working towards Carbon Reduction Commitment goals whilst keeping employees or patrons comfortable. The Workplace (Health, Safety and Welfare) Regulations 1992 states that:

Solutions

We are currently using Royal Mail Parcelforce and DPD as our delivery providers, all small items will be delivered by Royal Mail, these can take up to three working days to reach you. Anyhoo, my intentions were try and buy a good used Magnacleanse (power flush) filter and stuff that in where my wee Magnaclean is, and then does the bludy system to the hills, hopefully to finally clear the carp out of it. Sentinel X100 Inhibitor provides heavy-duty protection for commercial heating systems and closed cooling systems against limescale and corrosion. These two main culprits of commercial heating inefficiency can cause cold spots in the system, boiler inefficiency, noisy operation and other problems including system breakdown. Now refill the system. The chemicals will be circulated and mixed from there as long as the radiator was working before. You may have to bleed as you have introduced some air into the system. The associated ACOP goes on to explain that the ‘temperature in workrooms should normally be at least 16 degrees Celsius unless much of the work involves severe physical effort in which case the temperature should be at least 13 degrees Celsius.’

A few days ago my GW 30CXi started having CH issues, not being able to get up to temp, and with regular F26 trips (restricted system). Funnily enough, the DHW side is fine - yummy hot shower last night. Would have been better to not only empty the expansion tank but also to empty one of the radiators, this gives the necessary space for the new chemicals to get into the system. When using concentrate gel, add directly to the heating system either via a radiator air bleed valve, or via the fill loop using the appropriate adaptor and a suitable caulk gun. For details of how to dose using the Rapid-Dose format of this product, please watch the Rapid-Dose video. The chemicals probably will get through the complete system but will take a while to leach in the the main circulation.It's also better to add the chemicals into the radiator itself as the expansion tank pipe will probably be on the side of the tank and not the bottom (allows chemical to sit at the bottom of the tank before going down the expansion pipe). litre, 1 300ml aerosol or 1 275ml tube of Sentinel X400 High Performance Cleaner is sufficient to treat a typical domestic system of up to 10 radiators. Larger systems should be dosed with twice this amount. To clean an older system in accordance with BS 7593, this product should be circulated (preferably at normal operating temperature, with all valves open and the pump turned to maximum flow) for a minimum period of 2 hours or until satisfactory performance is restored. Use in conjunction with a powerflushing device to achieve a more rapid clean.

Sealed Systems: If the system is empty, add to any convenient point before filling. If full, use a Sentinel Dosing Vessel to inject via the filling loop or other access point. Where systems are badly fouled, we recommend a longer circulation period (approximately 3-4 weeks). The product is not aggressive and can be safely left in the system for extended periods.