Symptoms
In sealed systems without an expansion cistern, or if the cistern is in an awkward spot, there is apparently no easy way of adding the required Sentinel cleaner or treatment product.
Diagnosis
Some systems are sealed and have no need for an expansion cistern making dosing difficult. Others have the expansion cistern tucked into the corner of the attic and inaccessible.
Remedy
Some Sentinel products are available not just in 1 or 5L pour-packs, but also in Rapid Doseä aerosol cans and Concentrate gel cartridges for easy dosing into a convenient radiator or other dose point. Alternatively, Sentinel Dosing Vessel may be used with the standard pack products.
Treatment
Sentinel products are available in a range of formats for easy and rapid dosing to the system not just via the expansion tank, but also through radiators, air vents or filling loops.